ci: deploy upstream on changes

Relates to https://gitlab.skynet.ie/compsoc1/skynet/nixos/-/issues/22

test: Remove the account type limiatation

.forgejo/workflows/build.yaml

@@ -0,0 +1,17 @@
+name: Build
+
+on:
+  push:
+    branches:
+      - 'master'
+
+jobs:
+  # deploy it upstream
+  deploy:
+    runs-on: docker
+    steps:
+      - name: "Deploy to Skynet"
+        uses: https://forgejo.skynet.ie/Skynet/actions-deploy-to-skynet@v2
+        with:
+          input: 'simple-nixos-mailserver'
+          token: ${{ secrets.API_TOKEN_FORGEJO }}

.gitlab-ci.yml

@@ -3,11 +3,11 @@ hydra-pr:
     - merge_requests
   image: nixos/nix
   script:
-    - nix run -f channel:nixos-unstable hydra-cli -c hydra-cli -H https://hydra.nix-community.org jobset-wait simple-nixos-mailserver ${CI_MERGE_REQUEST_IID} || (echo Go to https://hydra.nix-community.org/jobset/simple-nixos-mailserver/${CI_MERGE_REQUEST_IID}/latest-eval for details; exit 1)
+    - nix-shell -I nixpkgs=channel:nixos-22.05 -p hydra-cli --run 'hydra-cli -H https://hydra.nix-community.org jobset-wait simple-nixos-mailserver ${CI_MERGE_REQUEST_IID}'
 
 hydra-master:
   only:
     - master
   image: nixos/nix
   script:
-    - nix run -f channel:nixos-unstable hydra-cli -c hydra-cli -H https://hydra.nix-community.org jobset-wait simple-nixos-mailserver master || (echo Go to https://hydra.nix-community.org/jobset/simple-nixos-mailserver/master/latest-eval for details; exit 1)
+    - nix-shell -I nixpkgs=channel:nixos-22.05 -p hydra-cli --run 'hydra-cli -H https://hydra.nix-community.org jobset-wait simple-nixos-mailserver master'

.hydra/declarative-jobsets.nix

@@ -1,4 +1,4 @@
-{ nixpkgs, declInput, pulls }:
+{ nixpkgs, pulls, ... }:
 
 let
   pkgs = import nixpkgs {};
@@ -8,65 +8,37 @@ let
     { enabled = 1;
       hidden = false;
       description = "PR ${num}: ${info.title}";
-      nixexprinput = "snm";
-      nixexprpath = ".hydra/default.nix";
       checkinterval = 30;
       schedulingshares = 20;
       enableemail = false;
       emailoverride = "";
       keepnr = 1;
-      type = 0;
+      type = 1;
-      inputs = {
+      flake = "gitlab:simple-nixos-mailserver/nixos-mailserver/merge-requests/${info.iid}/head";
-        snm = {
-          type = "git";
-          value = "${info.target_repo_url} merge-requests/${info.iid}/head";
-          emailresponsible = false;
-        };
-      };
     }
   ) prs;
+  mkFlakeJobset = branch: {
+    description = "Build ${branch} branch of Simple NixOS MailServer";
+    checkinterval = "60";
+    enabled = "1";
+    schedulingshares = 100;
+    enableemail = false;
+    emailoverride = "";
+    keepnr = 3;
+    hidden = false;
+    type = 1;
+    flake = "gitlab:simple-nixos-mailserver/nixos-mailserver/${branch}";
+  };
 
   desc = prJobsets // {
-    master = {
+    "master" = mkFlakeJobset "master";
-      description = "Build master branch of Simple NixOS MailServer";
+    "nixos-23.11" = mkFlakeJobset "nixos-23.11";
-      checkinterval = "60";
+    "nixos-24.05" = mkFlakeJobset "nixos-24.05";
-      enabled = "1";
+  };
-      nixexprinput = "snm";
+
-      nixexprpath = ".hydra/default.nix";
+  log = {
-      schedulingshares = 100;
+    pulls = prs;
-      enableemail = false;
+    jobsets = desc;
-      emailoverride = "";
-      keepnr = 3;
-      hidden = false;
-      type = 0;
-      inputs = {
-        snm = {
-          value = "https://gitlab.com/simple-nixos-mailserver/nixos-mailserver master";
-          type = "git";
-          emailresponsible = false;
-        };
-      };
-    };
-    "nixos-19.09" = {
-      description = "Build the nixos-19.09 branch of Simple NixOS MailServer";
-      checkinterval = "60";
-      enabled = "1";
-      nixexprinput = "snm";
-      nixexprpath = ".hydra/default.nix";
-      schedulingshares = 100;
-      enableemail = false;
-      emailoverride = "";
-      keepnr = 3;
-      hidden = false;
-      type = 0;
-      inputs = {
-        snm = {
-          value = "https://gitlab.com/simple-nixos-mailserver/nixos-mailserver nixos-19.09";
-          type = "git";
-          emailresponsible = false;
-        };
-      };
-    };
   };
 
 in {
@@ -74,5 +46,10 @@ in {
     cat >$out <<EOF
     ${builtins.toJSON desc}
     EOF
+    # This is to get nice .jobsets build logs on Hydra
+    cat >tmp <<EOF
+    ${builtins.toJSON log}
+    EOF
+    ${pkgs.jq}/bin/jq . tmp
   '';
 }

.readthedocs.yaml

@@ -0,0 +1,29 @@
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3"
+  apt_packages:
+    - nix
+    - proot
+  jobs:
+    pre_install:
+      - mkdir -p ~/.nix ~/.config/nix
+      - echo "experimental-features = nix-command flakes" > ~/.config/nix/nix.conf
+      - proot -b ~/.nix:/nix /bin/sh -c "nix build -L .#optionsDoc && cp -v result docs/options.md"
+
+sphinx:
+   configuration: docs/conf.py
+
+formats:
+  - pdf
+  - epub
+
+python:
+   install:
+   - requirements: docs/requirements.txt

README.md

@@ -3,20 +3,26 @@
 [![pipeline status](https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/badges/master/pipeline.svg)](https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/commits/master)
 
 
-## Stable Releases
+## Release branches
 
-* [SNM v2.3.0](https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/tags/v2.3.0)
+For each NixOS release, we publish a branch. You then have to use the
+SNM branch corresponding to your NixOS version.
 
-[Latest Release (Candidate)](https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/tags/v2.3.0)
+* For NixOS 24.05
+   - Use the [SNM branch `nixos-24.05`](https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/tree/nixos-24.05)
+   - [Documentation](https://nixos-mailserver.readthedocs.io/en/nixos-24.05/)
+   - [Release notes](https://nixos-mailserver.readthedocs.io/en/nixos-24.05/release-notes.html#nixos-24-05)
+* For NixOS 23.11
+   - Use the [SNM branch `nixos-23.11`](https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/tree/nixos-23.11)
+   - [Documentation](https://nixos-mailserver.readthedocs.io/en/nixos-23.11/)
+   - [Release notes](https://nixos-mailserver.readthedocs.io/en/nixos-23.11/release-notes.html#nixos-23-11)
+* For NixOS unstable
+   - Use the [SNM branch `master`](https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/tree/master)
+   - [Documentation](https://nixos-mailserver.readthedocs.io/en/latest/)
 
 [Subscribe to SNM Announcement List](https://www.freelists.org/list/snm)
 This is a very low volume list where new releases of SNM are announced, so you
-can stay up to date with bug fixes and updates. All announcements are signed by
+can stay up to date with bug fixes and updates.
-the gpg key with fingerprint
-
-```
-D9FE 4119 F082 6F15 93BD  BD36 6162 DBA5 635E A16A
-```
 
 
 ## Features
@@ -25,12 +31,15 @@ D9FE 4119 F082 6F15 93BD  BD36 6162 DBA5 635E A16A
  * [x] Multiple Domains
  * Postfix MTA
     - [x] smtp on port 25
-    - [x] submission port 587
+    - [x] submission tls on port 465
+    - [x] submission starttls on port 587
     - [x] lmtp with dovecot
  * Dovecot
     - [x] maildir folders
-    - [x] imap starttls on port 143
+    - [x] imap with tls on port 993
-    - [x] pop3 starttls on port 110
+    - [x] pop3 with tls on port 995
+    - [x] imap with starttls on port 143
+    - [x] pop3 with starttls on port 110
  * Certificates
     - [x] manual certificates
     - [x] on the fly creation
@@ -57,58 +66,23 @@ D9FE 4119 F082 6F15 93BD  BD36 6162 DBA5 635E A16A
   * DKIM Signing
     - [ ] Allow a per domain selector
 
-### Changelog and How to Stay Up-to-Date
+### Get in touch
-
-See the [mailing list archive](https://www.freelists.org/archive/snm/)
-
-### Quick Start
-
-```nix
-{ config, pkgs, ... }:
-{
-  imports = [
-    (builtins.fetchTarball {
-      url = "https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/archive/v2.3.0/nixos-mailserver-v2.3.0.tar.gz";
-      sha256 = "0lpz08qviccvpfws2nm83n7m2r8add2wvfg9bljx9yxx8107r919";
-    })
-  ];
-
-  mailserver = {
-    enable = true;
-    fqdn = "mail.example.com";
-    domains = [ "example.com" "example2.com" ];
-    loginAccounts = {
-        "user1@example.com" = {
-            hashedPassword = "$6$/z4n8AQl6K$kiOkBTWlZfBd7PvF5GsJ8PmPgdZsFGN1jPGZufxxr60PoR0oUsrvzm2oQiflyz5ir9fFJ.d/zKm/NgLXNUsNX/";
-
-            aliases = [
-                "info@example.com"
-                "postmaster@example.com"
-                "postmaster@example2.com"
-            ];
-        };
-    };
-  };
-}
-```
-
-For a complete list of options, see `default.nix`.
-
 
+- Subscribe to the [mailing list](https://www.freelists.org/archive/snm/)
+- Join the Libera Chat IRC channel `#nixos-mailserver`
 
 ## How to Set Up a 10/10 Mail Server Guide
-Check out the [Complete Setup Guide](https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/wikis/A-Complete-Setup-Guide) in the project's wiki.
 
-## How to Backup
+Check out the [Setup Guide](https://nixos-mailserver.readthedocs.io/en/latest/setup-guide.html) in the project's documentation.
 
-Checkout the [Complete Backup Guide](https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/wikis/A-Complete-Backup-Guide). Backups are easy with `SNM`.
+For a complete list of options, [see in readthedocs](https://nixos-mailserver.readthedocs.io/en/latest/options.html).
 
 ## Development
 
-See the [How to Develop SNM](https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/wikis/How-to-Develop-SNM) wiki page.
+See the [How to Develop SNM](https://nixos-mailserver.readthedocs.io/en/latest/howto-develop.html) documentation page.
 
 ## Contributors
-See the [contributor tab](https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/graphs/master)
+See the [contributor tab](https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/graphs/master)
 
 ### Alternative Implementations
  * [NixCloud Webservices](https://github.com/nixcloud/nixcloud-webservices)
@@ -120,6 +94,4 @@ See the [contributor tab](https://gitlab.com/simple-nixos-mailserver/nixos-mails
  * Logo made with [Logomakr.com](https://logomakr.com)
 
 
-
+[logo]: docs/logo.png
-
-[logo]: logo/logo.png

default.nix

@@ -1,4 +1,3 @@
-
 #  nixos-mailserver: a simple mail server
 #  Copyright (C) 2016-2018  Robin Raymond
 #
@@ -26,6 +25,12 @@ in
   options.mailserver = {
     enable = mkEnableOption "nixos-mailserver";
 
+    openFirewall = mkOption {
+      type = types.bool;
+      default = true;
+      description = "Automatically open ports in the firewall.";
+    };
+
     fqdn = mkOption {
       type = types.str;
       example = "mx.example.com";
@@ -39,6 +44,17 @@ in
       description = "The domains that this mail server serves.";
     };
 
+    certificateDomains = mkOption {
+      type = types.listOf types.str;
+      example = [ "imap.example.com" "pop3.example.com" ];
+      default = [];
+      description = ''
+        ({option}`mailserver.certificateScheme` == `acme-nginx`)
+
+        Secondary domains and subdomains for which it is necessary to generate a certificate.
+      '';
+    };
+
     messageSizeLimit = mkOption {
       type = types.int;
       example = 52428800;
@@ -47,7 +63,7 @@ in
     };
 
     loginAccounts = mkOption {
-      type = types.loaOf (types.submodule ({ name, ... }: {
+      type = types.attrsOf (types.submodule ({ name, ... }: {
         options = {
           name = mkOption {
             type = types.str;
@@ -63,11 +79,11 @@ in
               The user's hashed password. Use `mkpasswd` as follows
 
               ```
-              mkpasswd -m sha-512 "super secret password"
+              nix-shell -p mkpasswd --run 'mkpasswd -sm bcrypt'
               ```
 
               Warning: this is stored in plaintext in the Nix store!
-              Use `hashedPasswordFile` instead.
+              Use {option}`mailserver.loginAccounts.<name>.hashedPasswordFile` instead.
             '';
           };
 
@@ -79,7 +95,7 @@ in
               A file containing the user's hashed password. Use `mkpasswd` as follows
 
               ```
-              mkpasswd -m sha-512 "super secret password"
+              nix-shell -p mkpasswd --run 'mkpasswd -sm bcrypt'
               ```
             '';
           };
@@ -95,6 +111,15 @@ in
             '';
           };
 
+          aliasesRegexp = mkOption {
+            type = with types; listOf types.str;
+            example = [''/^tom\..*@domain\.com$/''];
+            default = [];
+            description = ''
+              Same as {option}`mailserver.aliases` but using PCRE (Perl compatible regex).
+            '';
+          };
+
           catchAll = mkOption {
             type = with types; listOf (enum cfg.domains);
             example = ["example.com" "example2.com"];
@@ -144,7 +169,7 @@ in
             description = ''
               Specifies if the account should be a send-only account.
               Emails sent to send-only accounts will be rejected from
-              unauthorized senders with the sendOnlyRejectMessage
+              unauthorized senders with the `sendOnlyRejectMessage`
               stating the reason.
             '';
           };
@@ -176,13 +201,256 @@ in
         follows
 
         ```
-        mkpasswd -m sha-512 "super secret password"
+        nix-shell -p mkpasswd --run 'mkpasswd -sm bcrypt'
         ```
       '';
       default = {};
     };
 
-    lmptSaveToDetailMailbox = mkOption {
+    ldap = {
+      enable = mkEnableOption "LDAP support";
+
+      uris  = mkOption {
+        type = types.listOf types.str;
+        example = literalExpression ''
+          [
+            "ldaps://ldap1.example.com"
+            "ldaps://ldap2.example.com"
+          ]
+        '';
+        description = ''
+          URIs where your LDAP server can be reached
+        '';
+      };
+
+      startTls = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Whether to enable StartTLS upon connection to the server.
+        '';
+      };
+
+      tlsCAFile = mkOption {
+        type = types.path;
+        default = "${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt";
+        defaultText = lib.literalMD "see [source](https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/blob/master/default.nix)";
+        description = ''
+          Certifificate trust anchors used to verify the LDAP server certificate.
+        '';
+      };
+
+      bind = {
+        dn = mkOption {
+          type = types.str;
+          example = "cn=mail,ou=accounts,dc=example,dc=com";
+          description = ''
+            Distinguished name used by the mail server to do lookups
+            against the LDAP servers.
+          '';
+        };
+
+        passwordFile = mkOption {
+          type = types.str;
+          example = "/run/my-secret";
+          description = ''
+            A file containing the password required to authenticate against the LDAP servers.
+          '';
+        };
+      };
+
+      searchBase = mkOption {
+        type = types.str;
+        example = "ou=people,ou=accounts,dc=example,dc=com";
+        description = ''
+          Base DN at below which to search for users accounts.
+        '';
+      };
+
+      searchScope = mkOption {
+        type = types.enum [ "sub" "base" "one" ];
+        default = "sub";
+        description = ''
+          Search scope below which users accounts are looked for.
+        '';
+      };
+
+      dovecot = {
+        userAttrs = mkOption {
+          type = types.nullOr types.str;
+          default = "";
+          description = ''
+            LDAP attributes to be retrieved during userdb lookups.
+
+            See the users_attrs reference at
+            https://doc.dovecot.org/configuration_manual/authentication/ldap_settings_auth/#user-attrs
+            in the Dovecot manual.
+          '';
+        };
+
+        userFilter = mkOption {
+          type = types.str;
+          default = "mail=%u";
+          example = "(&(objectClass=inetOrgPerson)(mail=%u))";
+          description = ''
+            Filter for user lookups in Dovecot.
+
+            See the user_filter reference at
+            https://doc.dovecot.org/configuration_manual/authentication/ldap_settings_auth/#user-filter
+            in the Dovecot manual.
+          '';
+        };
+
+        passAttrs = mkOption {
+          type = types.str;
+          default = "userPassword=password";
+          description = ''
+            LDAP attributes to be retrieved during passdb lookups.
+
+            See the pass_attrs reference at
+            https://doc.dovecot.org/configuration_manual/authentication/ldap_settings_auth/#pass-attrs
+            in the Dovecot manual.
+          '';
+        };
+
+        passFilter = mkOption {
+          type = types.nullOr types.str;
+          default = "mail=%u";
+          example = "(&(objectClass=inetOrgPerson)(mail=%u))";
+          description = ''
+            Filter for password lookups in Dovecot.
+
+            See the pass_filter reference for
+            https://doc.dovecot.org/configuration_manual/authentication/ldap_settings_auth/#pass-filter
+            in the Dovecot manual.
+          '';
+        };
+      };
+
+      postfix = {
+        filter = mkOption {
+          type = types.str;
+          default = "mail=%s";
+          example = "(&(objectClass=inetOrgPerson)(mail=%s))";
+          description = ''
+            LDAP filter used to search for an account by mail, where
+            `%s` is a substitute for the address in
+            question.
+          '';
+        };
+
+        uidAttribute = mkOption {
+          type = types.str;
+          default = "mail";
+          example = "uid";
+          description = ''
+            The LDAP attribute referencing the account name for a user.
+          '';
+        };
+
+        mailAttribute = mkOption {
+          type = types.str;
+          default = "mail";
+          description = ''
+            The LDAP attribute holding mail addresses for a user.
+          '';
+        };
+      };
+    };
+
+    indexDir = mkOption {
+      type = types.nullOr types.str;
+      default = null;
+      description = ''
+        Folder to store search indices. If null, indices are stored
+        along with email, which could not necessarily be desirable,
+        especially when {option}`mailserver.fullTextSearch.enable` is `true` since
+        indices it creates are voluminous and do not need to be backed
+        up.
+
+        Be careful when changing this option value since all indices
+        would be recreated at the new location (and clients would need
+        to resynchronize).
+
+        Note the some variables can be used in the file path. See
+        https://doc.dovecot.org/configuration_manual/mail_location/#variables
+        for details.
+      '';
+      example = "/var/lib/dovecot/indices";
+    };
+
+    fullTextSearch = {
+      enable = mkEnableOption "Full text search indexing with xapian. This has significant performance and disk space cost.";
+      autoIndex = mkOption {
+        type = types.bool;
+        default = true;
+        description = "Enable automatic indexing of messages as they are received or modified.";
+      };
+      autoIndexExclude = mkOption {
+        type = types.listOf types.str;
+        default = [ ];
+        example = [ "\\Trash" "SomeFolder" "Other/*" ];
+        description = ''
+          Mailboxes to exclude from automatic indexing.
+        '';
+      };
+
+      indexAttachments = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Also index text-only attachements. Binary attachements are never indexed.";
+      };
+
+      enforced = mkOption {
+        type = types.enum [ "yes" "no" "body" ];
+        default = "no";
+        description = ''
+          Fail searches when no index is available. If set to
+          `body`, then only body searches (as opposed to
+          header) are affected. If set to `no`, searches may
+          fall back to a very slow brute force search.
+        '';
+      };
+
+      minSize = mkOption {
+        type = types.int;
+        default = 2;
+        description = "Size of the smallest n-gram to index.";
+      };
+      maxSize = mkOption {
+        type = types.int;
+        default = 20;
+        description = "Size of the largest n-gram to index.";
+      };
+      memoryLimit = mkOption {
+        type = types.nullOr types.int;
+        default = null;
+        example = 2000;
+        description = "Memory limit for the indexer process, in MiB. If null, leaves the default (which is rather low), and if 0, no limit.";
+      };
+
+      maintenance = {
+        enable = mkOption {
+          type = types.bool;
+          default = true;
+          description = "Regularly optmize indices, as recommended by upstream.";
+        };
+
+        onCalendar = mkOption {
+          type = types.str;
+          default = "daily";
+          description = "When to run the maintenance job. See systemd.time(7) for more information about the format.";
+        };
+
+        randomizedDelaySec = mkOption {
+          type = types.int;
+          default = 1000;
+          description = "Run the maintenance job not exactly at the time specified with `onCalendar`, but plus or minus this many seconds.";
+        };
+      };
+    };
+
+    lmtpSaveToDetailMailbox = mkOption {
       type = types.enum ["yes" "no"];
       default = "yes";
       description = ''
@@ -193,14 +461,11 @@ in
     };
 
     extraVirtualAliases = mkOption {
-      type = types.loaOf (mkOptionType {
+      type = let
-        name = "Login Account";
+        loginAccount = mkOptionType {
-        check = (ele:
+          name = "Login Account";
-          let accounts = builtins.attrNames cfg.loginAccounts;
+        };
-          in if (builtins.isList ele)
+      in with types; attrsOf (either loginAccount (nonEmptyListOf loginAccount));
-            then (builtins.all (x: builtins.elem x accounts) ele) && (builtins.length ele > 0)
-            else (builtins.elem ele accounts));
-      });
       example = {
         "info@example.com" = "user1@example.com";
         "postmaster@example.com" = "user1@example.com";
@@ -221,6 +486,23 @@ in
       default = {};
     };
 
+    forwards = mkOption {
+      type = with types; attrsOf (either (listOf str) str);
+      example = {
+        "user@example.com" = "user@elsewhere.com";
+      };
+      description = ''
+        To forward mails to an external address. For instance,
+        the value {`"user@example.com" = "user@elsewhere.com";}`
+        means that mails to `user@example.com` are forwarded to
+        `user@elsewhere.com`. The difference with the
+        {option}`mailserver.extraVirtualAliases` option is that `user@elsewhere.com`
+        can't send mail as `user@example.com`. Also, this option
+        allows to forward mails to external addresses.
+      '';
+      default = {};
+    };
+
     rejectSender = mkOption {
       type = types.listOf types.str;
       example = [ "@example.com" "spammer@example.net" ];
@@ -248,7 +530,7 @@ in
       description = ''
         The unix UID of the virtual mail user.  Be mindful that if this is
         changed, you will need to manually adjust the permissions of
-        mailDirectory.
+        `mailDirectory`.
       '';
     };
 
@@ -291,6 +573,14 @@ in
       '';
     };
 
+    useUTF8FolderNames = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        Store mailbox names on disk using UTF-8 instead of modified UTF-7 (mUTF-7).
+      '';
+    };
+
     hierarchySeparator = mkOption {
       type = types.str;
       default = ".";
@@ -309,46 +599,46 @@ in
         The mailboxes for dovecot.
         Depending on the mail client used it might be necessary to change some mailbox's name.
       '';
-      default = [
+      default = {
-        {
+        Trash = {
-          name = "Trash";
           auto = "no";
           specialUse = "Trash";
-        }
+        };
-
+        Junk = {
-        {
-          name = "Junk";
           auto = "subscribe";
           specialUse = "Junk";
-        }
+        };
-
+        Drafts = {
-        {
-          name = "Drafts";
           auto = "subscribe";
           specialUse = "Drafts";
-        }
+        };
-
+        Sent = {
-        {
-          name = "Sent";
           auto = "subscribe";
           specialUse = "Sent";
-        }
+        };
-      ];
+      };
     };
 
-    certificateScheme = mkOption {
+    certificateScheme = let
-      type = types.enum [ 1 2 3 ];
+      schemes = [ "manual" "selfsigned" "acme-nginx" "acme" ];
-      default = 2;
+      translate = i: warn "Setting mailserver.certificateScheme by number is deprecated, please use names instead: 'mailserver.certificateScheme = ${builtins.toString i}' can be replaced by 'mailserver.certificateScheme = \"${(builtins.elemAt schemes (i - 1))}\"'."
+        (builtins.elemAt schemes (i - 1));
+    in mkOption {
+      type = with types; coercedTo (enum [ 1 2 3 ]) translate (enum schemes);
+      default = "selfsigned";
       description = ''
-        Certificate Files. There are three options for these.
+        The scheme to use for managing TLS certificates:
 
-        1) You specify locations and manually copy certificates there.
+        1. `manual`: you specify locations via {option}`mailserver.certificateFile` and
-        2) You let the server create new (self signed) certificates on the fly.
+           {option}`mailserver.keyFile` and manually copy certificates there.
-        3) You let the server create a certificate via `Let's Encrypt`. Note that
+        2. `selfsigned`: you let the server create new (self-signed) certificates on the fly.
-           this implies that a stripped down webserver has to be started. This also
+        3. `acme-nginx`: you let the server request certificates from [Let's Encrypt](https://letsencrypt.org)
-           implies that the FQDN must be set as an `A` record to point to the IP of
+           via NixOS' ACME module. By default, this will set up a stripped-down Nginx server for
-           the server. In particular port 80 on the server will be opened. For details
+           {option}`mailserver.fqdn` and open port 80. For this to work, the FQDN must be properly
-           on how to set up the domain records, see the guide in the readme.
+           configured to point to your server (see the [setup guide](setup-guide.rst) for more information).
+        4. `acme`: you already have an ACME certificate set up (for example, you're already running a TLS-enabled
+           Nginx server on the FQDN). This is better than `manual` because the appropriate services will be reloaded
+           when the certificate is renewed.
       '';
     };
 
@@ -356,8 +646,9 @@ in
       type = types.path;
       example = "/root/mail-server.crt";
       description = ''
-        Scheme 1)
+        ({option}`mailserver.certificateScheme` == `manual`)
-        Location of the certificate
+
+        Location of the certificate.
       '';
     };
 
@@ -365,8 +656,9 @@ in
       type = types.path;
       example = "/root/mail-server.key";
       description = ''
-        Scheme 1)
+        ({option}`mailserver.certificateScheme` == `manual`)
-        Location of the key file
+
+        Location of the key file.
       '';
     };
 
@@ -374,32 +666,56 @@ in
       type = types.path;
       default = "/var/certs";
       description = ''
-        Sceme 2)
+        ({option}`mailserver.certificateScheme` == `selfsigned`)
-        This is the folder where the certificate will be created. The name is
+
-        hardcoded to "cert-<domain>.pem" and "key-<domain>.pem" and the
+        This is the folder where the self-signed certificate will be created. The name is
+        hardcoded to "cert-DOMAIN.pem" and "key-DOMAIN.pem" and the
         certificate is valid for 10 years.
       '';
     };
 
+    acmeCertificateName = mkOption {
+      type = types.str;
+      default = cfg.fqdn;
+      example = "example.com";
+      description = ''
+          ({option}`mailserver.certificateScheme` == `acme`)
+
+        When the `acme` `certificateScheme` is selected, you can use this option
+        to override the default certificate name. This is useful if you've
+        generated a wildcard certificate, for example.
+      '';
+    };
+
     enableImap = mkOption {
       type = types.bool;
       default = true;
       description = ''
-        Whether to enable imap / pop3. Both variants are only supported in the
+        Whether to enable IMAP with STARTTLS on port 143.
-        (sane) startTLS configuration. The ports are
-
-        110 - Pop3
-        143 - IMAP
-        587 - SMTP with login
       '';
     };
 
     enableImapSsl = mkOption {
       type = types.bool;
-      default = false;
+      default = true;
       description = ''
-        Whether to enable IMAPS, setting this option to true will open port 993
+        Whether to enable IMAP with TLS in wrapper-mode on port 993.
-        in the firewall.
+      '';
+    };
+
+    enableSubmission = mkOption {
+      type = types.bool;
+      default = true;
+      description = ''
+        Whether to enable SMTP with STARTTLS on port 587.
+      '';
+    };
+
+    enableSubmissionSsl = mkOption {
+      type = types.bool;
+      default = true;
+      description = ''
+        Whether to enable SMTP with TLS in wrapper-mode on port 465.
       '';
     };
 
@@ -407,12 +723,7 @@ in
       type = types.bool;
       default = false;
       description = ''
-        Whether to enable POP3. Both variants are only supported in the (sane)
+        Whether to enable POP3 with STARTTLS on port on port 110.
-        startTLS configuration. The ports are
-
-        110 - Pop3
-        143 - IMAP
-        587 - SMTP with login
       '';
     };
 
@@ -420,8 +731,7 @@ in
       type = types.bool;
       default = false;
       description = ''
-        Whether to enable POP3S, setting this option to true will open port 995
+        Whether to enable POP3 with TLS in wrapper-mode on port 995.
-        in the firewall.
       '';
     };
 
@@ -437,6 +747,14 @@ in
       '';
     };
 
+    sieveDirectory = mkOption {
+      type = types.path;
+      default = "/var/sieve";
+      description = ''
+        Where to store the sieve scripts.
+      '';
+    };
+
     virusScanning = mkOption {
       type = types.bool;
       default = false;
@@ -458,7 +776,7 @@ in
       type = types.str;
       default = "mail";
       description = ''
-
+        The DKIM selector.
       '';
     };
 
@@ -466,7 +784,7 @@ in
       type = types.path;
       default = "/var/dkim";
       description = ''
-
+        The DKIM directory.
       '';
     };
 
@@ -477,12 +795,93 @@ in
             How many bits in generated DKIM keys. RFC6376 advises minimum 1024-bit keys.
 
             If you have already deployed a key with a different number of bits than specified
-            here, then you should use a different selector (dkimSelector). In order to get
+            here, then you should use a different selector ({option}`mailserver.dkimSelector`). In order to get
             this package to generate a key with the new number of bits, you will either have to
             change the selector or delete the old key file.
         '';
     };
 
+    dkimHeaderCanonicalization = mkOption {
+        type = types.enum ["relaxed" "simple"];
+        default = "relaxed";
+        description = ''
+          DKIM canonicalization algorithm for message headers.
+
+          See https://datatracker.ietf.org/doc/html/rfc6376/#section-3.4 for details.
+        '';
+    };
+
+    dkimBodyCanonicalization = mkOption {
+        type = types.enum ["relaxed" "simple"];
+        default = "relaxed";
+        description = ''
+          DKIM canonicalization algorithm for message bodies.
+
+          See https://datatracker.ietf.org/doc/html/rfc6376/#section-3.4 for details.
+        '';
+    };
+
+    dmarcReporting = {
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Whether to send out aggregated, daily DMARC reports in response to incoming
+          mail, when the sender domain defines a DMARC policy including the RUA tag.
+
+          This is helpful for the mail ecosystem, because it allows third parties to
+          get notified about SPF/DKIM violations originating from their sender domains.
+
+          See https://rspamd.com/doc/modules/dmarc.html#reporting
+        '';
+      };
+
+      localpart = mkOption {
+        type = types.str;
+        default = "dmarc-noreply";
+        example = "dmarc-report";
+        description = ''
+          The local part of the email address used for outgoing DMARC reports.
+        '';
+      };
+
+      domain = mkOption {
+        type = types.enum (cfg.domains);
+        example = "example.com";
+        description = ''
+          The domain from which outgoing DMARC reports are served.
+        '';
+      };
+
+      email = mkOption {
+        type = types.str;
+        default = with cfg.dmarcReporting; "${localpart}@${domain}";
+        defaultText = literalExpression ''"''${localpart}@''${domain}"'';
+        readOnly = true;
+        description = ''
+          The email address used for outgoing DMARC reports. Read-only.
+        '';
+      };
+
+      organizationName = mkOption {
+        type = types.str;
+        example = "ACME Corp.";
+        description = ''
+          The name of your organization used in the `org_name` attribute in
+          DMARC reports.
+        '';
+      };
+
+      fromName = mkOption {
+        type = types.str;
+        default = cfg.dmarcReporting.organizationName;
+        defaultText = literalMD "{option}`mailserver.dmarcReporting.organizationName`";
+        description = ''
+          The sender name for DMARC reports. Defaults to the organization name.
+        '';
+      };
+    };
+
     debug = mkOption {
       type = types.bool;
       default = false;
@@ -511,12 +910,20 @@ in
       '';
     };
 
+    recipientDelimiter = mkOption {
+      type = types.str;
+      default = "+";
+      description = ''
+        Configure the recipient delimiter.
+      '';
+    };
+
     redis = {
       address = mkOption {
         type = types.str;
         # read the default from nixos' redis module
         default = let
-          cf = config.services.redis.bind;
+          cf = config.services.redis.servers.rspamd.bind;
           cfdefault = if cf == null then "127.0.0.1" else cf;
           ips = lib.strings.splitString " " cfdefault;
           ip = lib.lists.head (ips ++ [ "127.0.0.1" ]);
@@ -525,28 +932,27 @@ in
         if (ip == "0.0.0.0" || ip == "::")
         then "127.0.0.1"
         else if isIpv6 ip then "[${ip}]" else ip;
+        defaultText = lib.literalMD "computed from `config.services.redis.servers.rspamd.bind`";
         description = ''
-          Address that rspamd should use to contact redis. The default value
+          Address that rspamd should use to contact redis.
-          is read from <literal>config.services.redis.bind</literal>.
         '';
       };
 
       port = mkOption {
         type = types.port;
-        default = config.services.redis.port;
+        default = config.services.redis.servers.rspamd.port;
+        defaultText = lib.literalExpression "config.services.redis.servers.rspamd.port";
         description = ''
-          Port that rspamd should use to contact redis. The default value is
+          Port that rspamd should use to contact redis.
-          read from <literal>config.services.redis.port<literal>.
         '';
       };
 
       password = mkOption {
         type = types.nullOr types.str;
-        default = config.services.redis.requirePass;
+        default = config.services.redis.servers.rspamd.requirePass;
+        defaultText = lib.literalExpression "config.services.redis.servers.rspamd.requirePass";
         description = ''
-          Password that rspamd should use to contact redis, or null if not
+          Password that rspamd should use to contact redis, or null if not required.
-          required. The default value is read from
-          <literal>config.services.redis.requirePass<literal>.
         '';
       };
     };
@@ -561,6 +967,48 @@ in
       '';
     };
 
+    smtpdForbidBareNewline = mkOption {
+      type = types.bool;
+      default = true;
+      description = ''
+        With "smtpd_forbid_bare_newline = yes", the Postfix SMTP server
+        disconnects a remote SMTP client that sends a line ending in a 'bare
+        newline'.
+
+        This feature was added in Postfix 3.8.4 against SMTP Smuggling and will
+        default to "yes" in Postfix 3.9.
+
+        https://www.postfix.org/smtp-smuggling.html
+      '';
+    };
+
+    sendingFqdn = mkOption {
+      type = types.str;
+      default = cfg.fqdn;
+      defaultText = lib.literalMD "{option}`mailserver.fqdn`";
+      example = "myserver.example.com";
+      description = ''
+        The fully qualified domain name of the mail server used to
+        identify with remote servers.
+
+        If this server's IP serves purposes other than a mail server,
+        it may be desirable for the server to have a name other than
+        that to which the user will connect.  For example, the user
+        might connect to mx.example.com, but the server's IP has
+        reverse DNS that resolves to myserver.example.com; in this
+        scenario, some mail servers may reject or penalize the
+        message.
+
+        This setting allows the server to identify as
+        myserver.example.com when forwarding mail, independently of
+        {option}`mailserver.fqdn` (which, for SSL reasons, should generally be the name
+        to which the user connects).
+
+        Set this to the name to which the sending IP's reverse DNS
+        resolves.
+      '';
+    };
+
     policydSPFExtraConfig = mkOption {
       type = types.lines;
       default = "";
@@ -621,10 +1069,11 @@ in
                 stop program = "${pkgs.systemd}/bin/systemctl stop dovecot2"
                 if failed host ${cfg.fqdn} port 993 type tcpssl sslauto protocol imap for 5 cycles then restart
 
-          check process rspamd with pidfile /var/run/rspamd.pid
+          check process rspamd with matching "rspamd: main process"
                 start program = "${pkgs.systemd}/bin/systemctl start rspamd"
                 stop program = "${pkgs.systemd}/bin/systemctl stop rspamd"
         '';
+        defaultText = lib.literalMD "see [source](https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/blob/master/default.nix)";
         description = ''
           The configuration used for monitoring via monit.
           Use a mail address that you actively check and set it via 'set alert ...'.
@@ -641,7 +1090,8 @@ in
         description = ''
           The location where borg saves the backups.
           This can be a local path or a remote location such as user@host:/path/to/repo.
-          It is exported and thus available as an environment variable to cmdPreexec and cmdPostexec.
+          It is exported and thus available as an environment variable to
+          {option}`mailserver.borgbackup.cmdPreexec` and {option}`mailserver.borgbackup.cmdPostexec`.
         '';
       };
 
@@ -701,13 +1151,14 @@ in
           default = "none";
           description = ''
             The backup can be encrypted by choosing any other value than 'none'.
-            When using encryption the password / passphrase must be provided in passphraseFile.
+            When using encryption the password/passphrase must be provided in `passphraseFile`.
           '';
         };
 
         passphraseFile = mkOption {
           type = types.nullOr types.path;
           default = null;
+          description = "Path to a file containing the encryption password or passphrase.";
         };
       };
 
@@ -723,6 +1174,7 @@ in
       locations = mkOption {
         type = types.listOf types.path;
         default = [cfg.mailDirectory];
+        defaultText = lib.literalExpression "[ config.mailserver.mailDirectory ]";
         description = "The locations that are to be backed up by borg.";
       };
 
@@ -743,9 +1195,10 @@ in
         default = null;
         description = ''
           The command to be executed before each backup operation.
-          This is called prior to borg init in the same script that runs borg init and create and cmdPostexec.
+          This is called prior to borg init in the same script that runs borg init and create and `cmdPostexec`.
-          Example:
+        '';
-            export BORG_RSH="ssh -i /path/to/private/key"
+        example = ''
+          export BORG_RSH="ssh -i /path/to/private/key"
         '';
       };
 
@@ -755,7 +1208,7 @@ in
         description = ''
           The command to be executed after each backup operation.
           This is called after borg create completed successfully and in the same script that runs
-          cmdPreexec, borg init and create.
+          `cmdPreexec`, borg init and create.
         '';
       };
 
@@ -768,7 +1221,7 @@ in
         example = true;
         description = ''
           Whether to enable automatic reboot after kernel upgrades.
-          This is to be used in conjunction with system.autoUpgrade.enable = true"
+          This is to be used in conjunction with `system.autoUpgrade.enable = true;`
         '';
       };
       method = mkOption {
@@ -843,7 +1296,9 @@ in
   };
 
   imports = [
+    ./mail-server/assertions.nix
     ./mail-server/borgbackup.nix
+    ./mail-server/debug.nix
     ./mail-server/rsnapshot.nix
     ./mail-server/clamav.nix
     ./mail-server/monit.nix

docs/Makefile

@@ -0,0 +1,20 @@
+# Minimal makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line, and also
+# from the environment for the first two.
+SPHINXOPTS    ?=
+SPHINXBUILD   ?= sphinx-build
+SOURCEDIR     = .
+BUILDDIR      = _build
+
+# Put it first so that "make" without argument is like "make help".
+help:
+	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+
+.PHONY: help Makefile
+
+# Catch-all target: route all unknown targets to Sphinx using the new
+# "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
+%: Makefile
+	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)

docs/add-radicale.rst

@@ -0,0 +1,55 @@
+Add Radicale
+============
+
+Configuration by @dotlambda
+
+Starting with Radicale 3 (first introduced in NixOS 20.09) the traditional
+crypt passwords are no longer supported.  Instead bcrypt passwords
+have to be used. These can still be generated using `mkpasswd -m bcrypt`.
+
+.. code:: nix
+
+   { config, pkgs, lib, ... }:
+
+   with lib;
+
+   let
+     mailAccounts = config.mailserver.loginAccounts;
+     htpasswd = pkgs.writeText "radicale.users" (concatStrings
+       (flip mapAttrsToList mailAccounts (mail: user:
+         mail + ":" + user.hashedPassword + "\n"
+       ))
+     );
+
+   in {
+     services.radicale = {
+       enable = true;
+       settings = {
+         auth = {
+           type = "htpasswd";
+           htpasswd_filename = "${htpasswd}";
+           htpasswd_encryption = "bcrypt";
+         };
+       };
+     };
+
+     services.nginx = {
+       enable = true;
+       virtualHosts = {
+         "cal.example.com" = {
+           forceSSL = true;
+           enableACME = true;
+           locations."/" = {
+             proxyPass = "http://localhost:5232/";
+             extraConfig = ''
+               proxy_set_header  X-Script-Name /;
+               proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;
+               proxy_pass_header Authorization;
+             '';
+           };
+         };
+       };
+     };
+
+     networking.firewall.allowedTCPPorts = [ 80 443 ];
+   }

docs/add-roundcube.rst

@@ -0,0 +1,32 @@
+Add Roundcube, a webmail
+========================
+
+The NixOS module for roundcube nearly works out of the box with SNM. By
+default, it sets up a nginx virtual host to serve the webmail, other web
+servers may require more work.
+
+.. code:: nix
+
+   { config, pkgs, lib, ... }:
+
+   with lib;
+
+   {
+     services.roundcube = {
+        enable = true;
+        # this is the url of the vhost, not necessarily the same as the fqdn of
+        # the mailserver
+        hostName = "webmail.example.com";
+        extraConfig = ''
+          # starttls needed for authentication, so the fqdn required to match
+          # the certificate
+          $config['smtp_host'] = "tls://${config.mailserver.fqdn}";
+          $config['smtp_user'] = "%u";
+          $config['smtp_pass'] = "%p";
+        '';
+     };
+
+     services.nginx.enable = true;
+
+     networking.firewall.allowedTCPPorts = [ 80 443 ];
+   }

docs/autodiscovery.rst

@@ -0,0 +1,18 @@
+Autodiscovery
+=============
+
+`RFC6186 <https://www.rfc-editor.org/rfc/rfc6186>`_ allows supporting email clients to automatically discover SMTP / IMAP addresses
+of the mailserver. For that, the following records are required:
+
+================= ==== ==== ======== ====== ==== =================
+Record            TTL  Type Priority Weight Port Value
+================= ==== ==== ======== ====== ==== =================
+_submission._tcp  3600 SRV  5        0      587  mail.example.com.
+_submissions._tcp 3600 SRV  5        0      465  mail.example.com.
+_imap._tcp        3600 SRV  5        0      143  mail.example.com.
+_imaps._tcp       3600 SRV  5        0      993  mail.example.com.
+================= ==== ==== ======== ====== ==== =================
+
+Please note that only a few MUAs currently implement this. For vendor-specific
+discovery mechanisms `automx <https://github.com/rseichter/automx2>`_ can be used instead.
+

docs/backup-guide.rst

@@ -0,0 +1,20 @@
+Backup Guide
+============
+
+First off you should have a backup of your ``configuration.nix`` file
+where you have the server config (but that is already in a git
+repository right?)
+
+Next you need to backup ``/var/vmail`` or whatever you have specified
+for the option ``mailDirectory``. This is where all the mails reside.
+Good options are a cron job with ``rsync`` or ``scp``. But really
+anything works, as it is simply a folder with plenty of files in it. If
+your backup solution does not preserve the owner of the files don’t
+forget to ``chown`` them to ``virtualMail:virtualMail`` if you copy them
+back (or whatever you specified as ``vmailUserName``, and
+``vmailGoupName``).
+
+Finally you can (optionally) make a backup of ``/var/dkim`` (or whatever
+you specified as ``dkimKeyDirectory``). If you should lose those don’t
+worry, new ones will be created on the fly. But you will need to repeat
+step ``B)5`` and correct all the ``dkim`` keys.

docs/conf.py

@@ -0,0 +1,61 @@
+# Configuration file for the Sphinx documentation builder.
+#
+# This file only contains a selection of the most common options. For a full
+# list see the documentation:
+# https://www.sphinx-doc.org/en/master/usage/configuration.html
+
+# -- Path setup --------------------------------------------------------------
+
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute, like shown here.
+#
+# import os
+# import sys
+# sys.path.insert(0, os.path.abspath('.'))
+
+
+# -- Project information -----------------------------------------------------
+
+project = 'NixOS Mailserver'
+copyright = '2022, NixOS Mailserver Contributors'
+author = 'NixOS Mailserver Contributors'
+
+
+# -- General configuration ---------------------------------------------------
+
+# Add any Sphinx extension module names here, as strings. They can be
+# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
+# ones.
+extensions = [
+    'myst_parser'
+]
+
+myst_enable_extensions = [
+    'colon_fence',
+    'linkify',
+]
+
+smartquotes = False
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['_templates']
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+# This pattern also affects html_static_path and html_extra_path.
+exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
+
+master_doc = 'index'
+
+# -- Options for HTML output -------------------------------------------------
+
+# The theme to use for HTML and HTML Help pages.  See the documentation for
+# a list of builtin themes.
+#
+html_theme = 'sphinx_rtd_theme'
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
+html_static_path = []

docs/faq.rst

@@ -0,0 +1,22 @@
+FAQ
+===
+
+``catchAll`` users can't send email as user other than themself
+---------------------------------------------------------------
+
+To allow a ``catchAll`` user to send mail with the address used as
+recipient, the option ``aliases`` has to be used instead of ``catchAll``.
+
+For instance, to allow ``user@example.com`` to catch all mails to the
+domain ``example.com`` and send mails with any address of this domain:
+
+
+.. code:: nix
+
+    mailserver.loginAccounts = {
+        "user@example.com" = {
+            aliases = [ "@example.com" ];
+        };
+    };
+
+See also `this discussion <https://github.com/r-raymond/nixos-mailserver/issues/49>`__ for details.

docs/flakes.rst

@@ -0,0 +1,30 @@
+Nix Flakes
+==========
+
+If you're using `flakes <https://nixos.wiki/wiki/Flakes>`__, you can use
+the following minimal ``flake.nix`` as an example:
+
+.. code:: nix
+
+   {
+     description = "NixOS configuration";
+
+     inputs.simple-nixos-mailserver.url = "gitlab:simple-nixos-mailserver/nixos-mailserver/nixos-20.09";
+
+     outputs = { self, nixpkgs, simple-nixos-mailserver }: {
+       nixosConfigurations = {
+         hostname = nixpkgs.lib.nixosSystem {
+           system = "x86_64-linux";
+           modules = [
+             simple-nixos-mailserver.nixosModule
+             {
+               mailserver = {
+                 enable = true;
+                 # ...
+               };
+             }
+           ];
+         };
+       };
+     };
+   }

docs/fts.rst

@@ -0,0 +1,69 @@
+Full text search
+==========================
+
+By default, when your IMAP client searches for an email containing some
+text in its *body*, dovecot will read all your email sequentially. This
+is very slow and IO intensive. To speed body searches up, it is possible to
+*index* emails with a plugin to dovecot, ``fts_xapian``.
+
+Enabling full text search
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+To enable indexing for full text search here is an example configuration.
+
+.. code:: nix
+
+  {
+    mailserver = {
+      # ...
+      fullTextSearch = {
+        enable = true;
+        # index new email as they arrive
+        autoIndex = true;
+        # this only applies to plain text attachments, binary attachments are never indexed
+        indexAttachments = true;
+        enforced = "body";
+      };
+    };
+  }
+
+
+The ``enforced`` parameter tells dovecot to fail any body search query that cannot
+use an index. This prevents dovecot to fall back to the IO-intensive brute
+force search.
+
+If you set ``autoIndex`` to ``false``, indices will be created when the IMAP client
+issues a search query, so latency will be high.
+
+Resource requirements
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+Indices created by the full text search feature can take more disk
+space than the emails themselves. By default, they are kept in the
+emails location. When enabling the full text search feature, it is
+recommended to move indices in a different location, such as
+(``/var/lib/dovecot/indices``) by using the option
+``mailserver.indexDir``.
+
+.. warning::
+
+   When the value of the ``indexDir`` option is changed, all dovecot
+   indices needs to be recreated: clients would need to resynchronize.
+
+Indexation itself is rather resouces intensive, in CPU, and for emails with
+large headers, in memory as well. Initial indexation of existing emails can take
+hours. If the indexer worker is killed or segfaults during indexation, it can
+be that it tried to allocate more memory than allowed. You can increase the memory
+limit by eg ``mailserver.fullTextSearch.memoryLimit = 2000`` (in MiB).
+
+Mitigating resources requirements
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+You can:
+
+* disable indexation of attachements ``mailserver.fullTextSearch.indexAttachments = false``
+* reduce the size of ngrams to be indexed ``mailserver.fullTextSearch.minSize`` and ``maxSize``
+* disable automatic indexation for some folders with
+  ``mailserver.fullTextSearch.autoIndexExclude``.  Folders can be specified by
+  name (``"Trash"``), by special use (``"\\Junk"``) or with a wildcard.
+

docs/howto-develop.rst

@@ -0,0 +1,72 @@
+Contribute or troubleshoot
+==========================
+
+To report an issue, please go to
+`<https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/issues>`_.
+
+You can also chat with us on the Libera IRC channel ``#nixos-mailserver``.
+
+Run NixOS tests
+---------------
+
+To run the test suite, you need to enable `Nix Flakes
+<https://nixos.wiki/wiki/Flakes#Installing_flakes>`_.
+
+You can then run the testsuite via
+
+::
+
+   $ nix flake check -L
+
+Since Nix doesn't garantee your machine have enough resources to run
+all test VMs in parallel, some tests can fail. You would then haev to
+run tests manually. For instance:
+
+::
+
+   $ nix build .#hydraJobs.x86_64-linux.external-unstable -L
+
+
+Contributing to the documentation
+---------------------------------
+
+The documentation is written in RST (except option documentation which is in CommonMark),
+built with Sphinx and published by `Read the Docs <https://readthedocs.org/>`_.
+
+For the syntax, see the `RST/Sphinx primer
+<https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html>`_.
+
+To build the documentation, you need to enable `Nix Flakes
+<https://nixos.wiki/wiki/Flakes#Installing_flakes>`_.
+
+
+::
+
+   $ nix build .#documentation
+   $ xdg-open result/index.html
+
+Nixops
+------
+
+You can test the setup via ``nixops``. After installation, do
+
+::
+
+   $ nixops create nixops/single-server.nix nixops/vbox.nix -d mail
+   $ nixops deploy -d mail
+   $ nixops info -d mail
+
+You can then test the server via e.g. \ ``telnet``. To log into it, use
+
+::
+
+   $ nixops ssh -d mail mailserver
+
+Imap
+----
+
+To test imap manually use
+
+::
+
+   $ openssl s_client -host mail.example.com -port 143 -starttls imap

docs/index.rst

@@ -0,0 +1,40 @@
+.. NixOS Mailserver documentation master file, created by
+   sphinx-quickstart on Thu Jul  2 20:50:36 2020.
+   You can adapt this file completely to your liking, but it should at least
+   contain the root `toctree` directive.
+
+Welcome to NixOS Mailserver's documentation!
+============================================
+
+.. image:: logo.png
+   :width: 400
+   :alt: SNM Logo
+
+.. toctree::
+   :maxdepth: 2
+
+   setup-guide
+   howto-develop
+   faq
+   release-notes
+   options
+
+.. toctree::
+   :maxdepth: 1
+   :caption: How-to
+
+   backup-guide
+   add-radicale
+   add-roundcube
+   rspamd-tuning
+   fts
+   flakes
+   autodiscovery
+   ldap
+
+Indices and tables
+==================
+
+* :ref:`genindex`
+* :ref:`modindex`
+* :ref:`search`

docs/ldap.rst

@@ -0,0 +1,14 @@
+LDAP Support
+============
+
+It is possible to manage mail user accounts with LDAP rather than with
+the option `loginAccounts <options.html#mailserver-loginaccounts>`_.
+
+All related LDAP options are described in the `LDAP options section
+<options.html#mailserver-ldap>`_ and the `LDAP test
+<https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/blob/master/tests/ldap.nix>`_
+provides a getting started example.
+
+.. note::
+   The LDAP support can not be enabled if some accounts are also defined with ``mailserver.loginAccounts``.
+

docs/release-notes.rst

@@ -0,0 +1,70 @@
+Release Notes
+=============
+
+NixOS 24.05
+-----------
+
+- Add new option ``acmeCertificateName`` which can be used to support
+  wildcard certificates
+
+NixOS 23.11
+-----------
+
+- Add basic support for LDAP users
+- Add support for regex (PCRE) aliases
+
+NixOS 23.05
+-----------
+
+- Existing ACME certificates can be reused without configuring NGINX
+- Certificate scheme is no longer a number, but a meaningful string instead
+
+NixOS 22.11
+-----------
+
+- Allow Rspamd to send DMARC reporting
+  (`merge request <https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/merge_requests/244>`__)
+
+NixOS 22.05
+-----------
+
+- Make NixOS Mailserver options discoverable from search.nixos.org
+- Add a roundcube setup guide in the documentation
+
+NixOS 21.11
+-----------
+
+- Switch default DKIM body policy from simple to relaxed
+  (`merge request <https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/merge_requests/247>`__)
+- Ensure locally-delivered mails have the X-Original-To header
+  (`merge request <https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/merge_requests/243>`__)
+- NixOS Mailserver options are detailed in the `documentation
+  <https://nixos-mailserver.readthedocs.io/en/latest/options.html>`__
+- New options ``dkimBodyCanonicalization`` and
+  ``dkimHeaderCanonicalization``
+- New option ``certificateDomains`` to generate certificate for
+  additional domains (such as ``imap.example.com``)
+
+
+NixOS 21.05
+-----------
+
+- New `fullTextSearch` option to search in messages (based on Xapian)
+  (`Merge Request <https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/merge_requests/212>`__)
+- Flake support
+  (`Merge Request <https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/merge_requests/200>`__)
+- New `openFirewall` option defaulting to `true`
+- We moved from Freenode to Libera Chat
+
+NixOS 20.09
+-----------
+
+- IMAP and Submission with TLS wrapped-mode are now enabled by default
+  on ports 993 and 465 respectively
+- OpenDKIM is now sandboxed with Systemd
+- New `forwards` option to forwards emails to external addresses
+  (`Merge Request <https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/merge_requests/193>`__)
+- New `sendingFqdn` option to specify the fqdn of the machine sending
+  email (`Merge Request <https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/merge_requests/187>`__)
+- Move the Gitlab wiki to `ReadTheDocs
+  <https://nixos-mailserver.readthedocs.io/en/latest/>`_

docs/requirements.txt

@@ -0,0 +1,4 @@
+sphinx ~= 5.3
+sphinx_rtd_theme ~= 1.1
+myst-parser ~= 0.18
+linkify-it-py ~= 2.0

docs/rspamd-tuning.rst

@@ -0,0 +1,113 @@
+Tune spam filtering
+===================
+
+SNM comes with the `rspamd spam filtering system <https://rspamd.com/>`_
+enabled by default. Although its out-of-the-box performance is good, you
+can increase its efficiency by tuning its behaviour.
+
+Auto-learning
+~~~~~~~~~~~~~
+
+Moving spam email to the Junk folder (and false-positives out of it) will
+trigger an automatic training of the Bayesian filters, improving filtering
+of future emails.
+
+Train from existing folders
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+If you kept previous spam, you can train the filter from it. Note that the
+`rspamd FAQ <https://rspamd.com/doc/faq.html#how-can-i-learn-messages>`_
+indicates that *you should always learn both classes with almost equal
+amount of messages to increase performance of the statistical engine.*
+
+You can run the training in a root shell as follows:
+
+.. code:: bash
+
+  # Path to the controller socket
+  export RSOCK="/var/run/rspamd/worker-controller.sock"
+
+  # Learn the Junk folder as spam
+  rspamc -h $RSOCK learn_spam /var/vmail/$DOMAIN/$USER/.Junk/cur/
+
+  # Learn the INBOX as ham
+  rspamc -h $RSOCK learn_ham /var/vmail/$DOMAIN/$USER/cur/
+
+  # Check that training was successful
+  rspamc -h $RSOCK stat | grep learned
+
+Tune symbol weight
+~~~~~~~~~~~~~~~~~~
+
+The ``X-Spamd-Result`` header is automatically added to your emails, detailing
+the scoring decisions. The `modules documentation <https://rspamd.com/doc/modules/>`_
+details the meaning of each symbol. You can tune the weight if a symbol if needed.
+
+.. code:: nix
+
+  services.rspamd.locals = {
+    "groups.conf".text = ''
+      symbols {
+        "FORGED_RECIPIENTS" { weight = 0; }
+      }'';
+  };
+
+Tune action thresholds
+~~~~~~~~~~~~~~~~~~~~~~
+
+After scoring the message, rspamd decides on an action based on configurable thresholds.
+By default, rspamd will tell postfix to reject any message with a score higher than 15.
+If you experience issues in scoring or want to stay on the safe side, you can disable
+this behaviour by tuning the configuration. For example:
+
+.. code:: nix
+
+  services.rspamd.extraConfig = ''
+    actions {
+      reject = null; # Disable rejects, default is 15
+      add_header = 6; # Add header when reaching this score
+      greylist = 4; # Apply greylisting when reaching this score
+    }
+  '';
+
+
+Access the rspamd web UI
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+Rspamd comes with `a web interface <https://rspamd.com/webui/>`_ that displays statistics
+and history of past scans. **We do NOT recommend using it to change the configuration**
+as doing so will override values from the configuration set in the previous sections.
+
+The UI is served on the ``/var/run/rspamd/worker-controller.sock`` Unix socket. Here are
+two ways to access it from your browser.
+
+With ssh forwarding
+^^^^^^^^^^^^^^^^^^^
+
+For occasional access, the simplest way is to forward the socket to localhost and open
+http://localhost:3333 in your browser.
+
+.. code:: shell
+
+  ssh -L 3333:/run/rspamd/worker-controller.sock $HOSTNAME
+
+With an nginx reverse-proxy
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+If you have a secured nginx reverse proxy set on the host, you can use it to expose the socket.
+**Keep in mind the UI is unsecured by default, you need to setup an authentication scheme**, for
+exemple with `basic auth <https://docs.nginx.com/nginx/admin-guide/security-controls/configuring-http-basic-authentication/>`_:
+
+.. code:: nix
+
+  services.nginx.virtualHosts.rspamd = {
+    forceSSL = true;
+    enableACME = true;
+    basicAuthFile = "/basic/auth/hashes/file";
+    serverName = "rspamd.example.com";
+    locations = {
+      "/" = {
+        proxyPass = "http://unix:/run/rspamd/worker-controller.sock:/";
+      };
+    };
+  };

docs/setup-guide.rst

@@ -0,0 +1,227 @@
+Setup Guide
+===========
+
+Mail servers can be a tricky thing to set up. This guide is supposed to
+run you through the most important steps to achieve a 10/10 score on
+`<https://mail-tester.com>`_.
+
+What you need is:
+
+- a server running NixOS with a public IP
+- a domain name.
+
+.. note::
+
+   In the following, we consider a server with the public IP ``1.2.3.4``
+   and the domain ``example.com``.
+
+First, we will set the minimum DNS configuration to be able to deploy
+an up and running mail server. Once the server is deployed, we could
+then set all DNS entries required to send and receive mails on this
+server.
+
+Setup DNS A record for server
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Add a DNS record to the domain ``example.com`` with the following
+entries
+
+==================== ===== ==== =============
+Name (Subdomain)     TTL   Type Value
+==================== ===== ==== =============
+``mail.example.com`` 10800 A    ``1.2.3.4``
+==================== ===== ==== =============
+
+You can check this with
+
+::
+
+   $ ping mail.example.com
+   64 bytes from mail.example.com (1.2.3.4): icmp_seq=1 ttl=46 time=21.3 ms
+   ...
+
+Note that it can take a while until a DNS entry is propagated. This
+DNS entry is required for the Let's Encrypt certificate generation
+(which is used in the below configuration example).
+
+Setup the server
+~~~~~~~~~~~~~~~~
+
+The following describes a server setup that is fairly complete. Even
+though there are more possible options (see the `NixOS Mailserver
+options documentation <options.html>`_), these should be the most
+common ones.
+
+.. code:: nix
+
+   { config, pkgs, ... }: {
+     imports = [
+       (builtins.fetchTarball {
+         # Pick a release version you are interested in and set its hash, e.g.
+         url = "https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/archive/nixos-23.05/nixos-mailserver-nixos-23.05.tar.gz";
+         # To get the sha256 of the nixos-mailserver tarball, we can use the nix-prefetch-url command:
+         # release="nixos-23.05"; nix-prefetch-url "https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/archive/${release}/nixos-mailserver-${release}.tar.gz" --unpack
+         sha256 = "0000000000000000000000000000000000000000000000000000";
+       })
+     ];
+
+     mailserver = {
+       enable = true;
+       fqdn = "mail.example.com";
+       domains = [ "example.com" ];
+
+       # A list of all login accounts. To create the password hashes, use
+       # nix-shell -p mkpasswd --run 'mkpasswd -sm bcrypt'
+       loginAccounts = {
+         "user1@example.com" = {
+           hashedPasswordFile = "/a/file/containing/a/hashed/password";
+           aliases = ["postmaster@example.com"];
+         };
+         "user2@example.com" = { ... };
+       };
+
+       # Use Let's Encrypt certificates. Note that this needs to set up a stripped
+       # down nginx and opens port 80.
+       certificateScheme = "acme-nginx";
+     };
+     security.acme.acceptTerms = true;
+     security.acme.defaults.email = "security@example.com";
+   }
+
+After a ``nixos-rebuild switch`` your server should be running all
+mail components.
+
+Setup all other DNS requirements
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Set rDNS (reverse DNS) entry for server
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Wherever you have rented your server, you should be able to set reverse
+DNS entries for the IP’s you own. Add an entry resolving ``1.2.3.4``
+to ``mail.example.com``.
+
+.. warning::
+
+   We don't recommend setting up a mail server if you are not able to
+   set a reverse DNS on your public IP because sent emails would be
+   mostly marked as spam. Note that many residential ISP providers
+   don't allow you to set a reverse DNS entry.
+
+You can check this with
+
+::
+
+   $ nix-shell -p bind --command "host 1.2.3.4"
+   4.3.2.1.in-addr.arpa domain name pointer mail.example.com.
+
+Note that it can take a while until a DNS entry is propagated.
+
+Set a ``MX`` record
+^^^^^^^^^^^^^^^^^^^
+
+
+Add a ``MX`` record to the domain ``example.com``.
+
+================ ==== ======== =================
+Name (Subdomain) Type Priority Value
+================ ==== ======== =================
+example.com      MX   10       mail.example.com
+================ ==== ======== =================
+
+You can check this with
+
+::
+
+   $ nix-shell -p bind --command "host -t mx example.com"
+   example.com mail is handled by 10 mail.example.com.
+
+Note that it can take a while until a DNS entry is propagated.
+
+Set a ``SPF`` record
+^^^^^^^^^^^^^^^^^^^^
+
+Add a `SPF <https://en.wikipedia.org/wiki/Sender_Policy_Framework>`_
+record to the domain ``example.com``.
+
+================ ===== ==== ================================
+Name (Subdomain) TTL   Type Value
+================ ===== ==== ================================
+example.com      10800 TXT  `v=spf1 a:mail.example.com -all`
+================ ===== ==== ================================
+
+You can check this with
+
+::
+
+   $ nix-shell -p bind --command "host -t TXT example.com"
+   example.com descriptive text "v=spf1 a:mail.example.com -all"
+
+Note that it can take a while until a DNS entry is propagated.
+
+Set ``DKIM`` signature
+^^^^^^^^^^^^^^^^^^^^^^
+
+On your server, the ``opendkim`` systemd service generated a file
+containing your DKIM public key in the file
+``/var/dkim/example.com.mail.txt``. The content of this file looks
+like
+
+::
+
+   mail._domainkey IN TXT "v=DKIM1; k=rsa; s=email; p=<really-long-key>" ; ----- DKIM mail for domain.tld
+
+where ``really-long-key`` is your public key.
+
+Based on the content of this file, we can add a ``DKIM`` record to the
+domain ``example.com``.
+
+=========================== ===== ==== ==============================
+Name (Subdomain)            TTL   Type Value
+=========================== ===== ==== ==============================
+mail._domainkey.example.com 10800 TXT  ``v=DKIM1; p=<really-long-key>``
+=========================== ===== ==== ==============================
+
+You can check this with
+
+::
+
+   $ nix-shell -p bind --command "host -t txt mail._domainkey.example.com"
+   mail._domainkey.example.com descriptive text "v=DKIM1;p=<really-long-key>"
+
+Note that it can take a while until a DNS entry is propagated.
+
+Set a ``DMARC`` record
+^^^^^^^^^^^^^^^^^^^^^^
+
+Add a ``DMARC`` record to the domain ``example.com``.
+
+======================== ===== ==== ====================
+Name (Subdomain)         TTL   Type Value
+======================== ===== ==== ====================
+_dmarc.example.com       10800 TXT  ``v=DMARC1; p=none``
+======================== ===== ==== ====================
+
+You can check this with
+
+::
+
+   $ nix-shell -p bind --command "host -t TXT _dmarc.example.com"
+   _dmarc.example.com descriptive text "v=DMARC1; p=none"
+
+Note that it can take a while until a DNS entry is propagated.
+
+
+Test your Setup
+~~~~~~~~~~~~~~~
+
+Write an email to your aunt (who has been waiting for your reply far too
+long), and sign up for some of the finest newsletters the Internet has.
+Maybe you want to sign up for the `SNM Announcement
+List <https://www.freelists.org/list/snm>`__?
+
+Besides that, you can send an email to
+`mail-tester.com <https://www.mail-tester.com/>`__ and see how you
+score, and let `mxtoolbox.com <http://mxtoolbox.com/>`__ take a look at
+your setup, but if you followed the steps closely then everything should
+be awesome!

flake.lock

@@ -0,0 +1,76 @@
+{
+  "nodes": {
+    "blobs": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1604995301,
+        "narHash": "sha256-wcLzgLec6SGJA8fx1OEN1yV/Py5b+U5iyYpksUY/yLw=",
+        "owner": "simple-nixos-mailserver",
+        "repo": "blobs",
+        "rev": "2cccdf1ca48316f2cfd1c9a0017e8de5a7156265",
+        "type": "gitlab"
+      },
+      "original": {
+        "owner": "simple-nixos-mailserver",
+        "repo": "blobs",
+        "type": "gitlab"
+      }
+    },
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1696426674,
+        "narHash": "sha256-kvjfFW7WAETZlt09AgDn1MrtKzP7t90Vf7vypd3OL1U=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "0f9255e01c2351cc7d116c072cb317785dd33b33",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1717602782,
+        "narHash": "sha256-pL9jeus5QpX5R+9rsp3hhZ+uplVHscNJh8n8VpqscM0=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "e8057b67ebf307f01bdcc8fba94d94f75039d1f6",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-unstable",
+        "type": "indirect"
+      }
+    },
+    "nixpkgs-24_05": {
+      "locked": {
+        "lastModified": 1717144377,
+        "narHash": "sha256-F/TKWETwB5RaR8owkPPi+SPJh83AQsm6KrQAlJ8v/uA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "805a384895c696f802a9bf5bf4720f37385df547",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-24.05",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "blobs": "blobs",
+        "flake-compat": "flake-compat",
+        "nixpkgs": "nixpkgs",
+        "nixpkgs-24_05": "nixpkgs-24_05"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,127 @@
+{
+  description = "A complete and Simple Nixos Mailserver";
+
+  inputs = {
+    flake-compat = {
+      url = "github:edolstra/flake-compat";
+      flake = false;
+    };
+    nixpkgs.url = "flake:nixpkgs/nixos-unstable";
+    nixpkgs-24_05.url = "flake:nixpkgs/nixos-24.05";
+    blobs = {
+      url = "gitlab:simple-nixos-mailserver/blobs";
+      flake = false;
+    };
+  };
+
+  outputs = { self, blobs, nixpkgs, nixpkgs-24_05, ... }: let
+    lib = nixpkgs.lib;
+    system = "x86_64-linux";
+    pkgs = nixpkgs.legacyPackages.${system};
+    releases = [
+      {
+        name = "unstable";
+        pkgs = nixpkgs.legacyPackages.${system};
+      }
+      {
+        name = "24.05";
+        pkgs = nixpkgs-24_05.legacyPackages.${system};
+      }
+    ];
+    testNames = [
+      "internal"
+      "external"
+      "clamav"
+      "multiple"
+      "ldap"
+    ];
+    genTest = testName: release: {
+      "name"= "${testName}-${builtins.replaceStrings ["."] ["_"] release.name}";
+      "value"= import (./tests/. + "/${testName}.nix") {
+        pkgs = release.pkgs;
+        inherit blobs;
+      };
+    };
+    # Generate an attribute set such as
+    # {
+    #   external-unstable = <derivation>;
+    #   external-21_05 = <derivation>;
+    #   ...
+    # }
+    allTests = lib.listToAttrs (
+      lib.flatten (map (t: map (r: genTest t r) releases) testNames));
+
+    mailserverModule = import ./.;
+
+    # Generate a MarkDown file describing the options of the NixOS mailserver module
+    optionsDoc = let
+      eval = lib.evalModules {
+        modules = [
+          mailserverModule
+          {
+            _module.check = false;
+            mailserver = {
+              fqdn = "mx.example.com";
+              domains = [
+                "example.com"
+              ];
+              dmarcReporting = {
+                organizationName = "Example Corp";
+                domain = "example.com";
+              };
+            };
+          }
+        ];
+      };
+      options = builtins.toFile "options.json" (builtins.toJSON
+        (lib.filter (opt: opt.visible && !opt.internal && lib.head opt.loc == "mailserver")
+          (lib.optionAttrSetToDocList eval.options)));
+    in pkgs.runCommand "options.md" { buildInputs = [pkgs.python3Minimal]; } ''
+      echo "Generating options.md from ${options}"
+      python ${./scripts/generate-options.py} ${options} > $out
+    '';
+
+    documentation = pkgs.stdenv.mkDerivation {
+      name = "documentation";
+      src = lib.sourceByRegex ./docs ["logo\\.png" "conf\\.py" "Makefile" ".*\\.rst"];
+      buildInputs = [(
+        pkgs.python3.withPackages (p: with p; [
+          sphinx
+          sphinx_rtd_theme
+          myst-parser
+          linkify-it-py
+        ])
+      )];
+      buildPhase = ''
+        cp ${optionsDoc} options.md
+        # Workaround for https://github.com/sphinx-doc/sphinx/issues/3451
+        unset SOURCE_DATE_EPOCH
+        make html
+      '';
+      installPhase = ''
+        cp -Tr _build/html $out
+      '';
+    };
+
+  in {
+    nixosModules = rec {
+      mailserver = mailserverModule;
+      default = mailserver;
+    };
+    nixosModule = self.nixosModules.default; # compatibility
+    hydraJobs.${system} = allTests // {
+      inherit documentation;
+    };
+    checks.${system} = allTests;
+    packages.${system} = {
+      inherit optionsDoc documentation;
+    };
+    devShells.${system}.default = pkgs.mkShell {
+      inputsFrom = [ documentation ];
+      packages = with pkgs; [
+        clamav
+      ];
+    };
+    devShell.${system} = self.devShells.${system}.default; # compatibility
+  };
+}

mail-server/assertions.nix

@@ -0,0 +1,18 @@
+{ config, lib, pkgs, ... }:
+{
+  assertions = lib.optionals config.mailserver.ldap.enable [
+    {
+      assertion = config.mailserver.loginAccounts == {};
+      message = "When the LDAP support is enable (mailserver.ldap.enable = true), it is not possible to define mailserver.loginAccounts";
+    }
+    {
+      assertion = config.mailserver.forwards == {};
+      message = "When the LDAP support is enable (mailserver.ldap.enable = true), it is not possible to define mailserver.forwards";
+    }
+  ] ++ lib.optionals (config.mailserver.enable && config.mailserver.certificateScheme != "acme") [
+    {
+      assertion = config.mailserver.acmeCertificateName == config.mailserver.fqdn;
+      message = "When the certificate scheme is not 'acme' (mailserver.certificateScheme != \"acme\"), it is not possible to define mailserver.acmeCertificateName";
+    }
+  ];
+}

mail-server/clamav.nix

@@ -14,19 +14,17 @@
 #  You should have received a copy of the GNU General Public License
 #  along with this program. If not, see <http://www.gnu.org/licenses/>
 
-{ config, pkgs, lib, ... }:
+{ config, pkgs, lib, options, ... }:
 
 let
   cfg = config.mailserver;
 in
 {
   config = lib.mkIf (cfg.enable && cfg.virusScanning) {
-    services.clamav.daemon.enable = true;
+    services.clamav.daemon = {
+      enable = true;
+      settings.PhishingScanURLs = "no";
+    };
     services.clamav.updater.enable = true;
-
-    services.clamav.daemon.extraConfig = ''
-      PhishingScanURLs no
-    '';
   };
 }
-

mail-server/common.nix

@@ -21,22 +21,22 @@ let
 in
 {
   # cert :: PATH
-  certificatePath = if cfg.certificateScheme == 1
+  certificatePath = if cfg.certificateScheme == "manual"
              then cfg.certificateFile
-             else if cfg.certificateScheme == 2
+             else if cfg.certificateScheme == "selfsigned"
                   then "${cfg.certificateDirectory}/cert-${cfg.fqdn}.pem"
-                  else if cfg.certificateScheme == 3
+                  else if cfg.certificateScheme == "acme" || cfg.certificateScheme == "acme-nginx"
-                       then "/var/lib/acme/${cfg.fqdn}/fullchain.pem"
+                       then "${config.security.acme.certs.${cfg.acmeCertificateName}.directory}/fullchain.pem"
-                       else throw "Error: Certificate Scheme must be in { 1, 2, 3 }";
+                       else throw "unknown certificate scheme";
 
   # key :: PATH
-  keyPath = if cfg.certificateScheme == 1
+  keyPath = if cfg.certificateScheme == "manual"
         then cfg.keyFile
-        else if cfg.certificateScheme == 2
+        else if cfg.certificateScheme == "selfsigned"
              then "${cfg.certificateDirectory}/key-${cfg.fqdn}.pem"
-              else if cfg.certificateScheme == 3
+              else if cfg.certificateScheme == "acme" || cfg.certificateScheme == "acme-nginx"
-                   then "/var/lib/acme/${cfg.fqdn}/key.pem"
+                   then "${config.security.acme.certs.${cfg.acmeCertificateName}.directory}/key.pem"
-                   else throw "Error: Certificate Scheme must be in { 1, 2, 3 }";
+                   else throw "unknown certificate scheme";
 
   passwordFiles = let
     mkHashFile = name: hash: pkgs.writeText "${builtins.hashString "sha256" name}-password-hash" hash;
@@ -45,4 +45,26 @@ in
     if value.hashedPasswordFile == null then
       builtins.toString (mkHashFile name value.hashedPassword)
     else value.hashedPasswordFile) cfg.loginAccounts;
+
+  # Appends the LDAP bind password to files to avoid writing this
+  # password into the Nix store.
+  appendLdapBindPwd = {
+    name, file, prefix, suffix ? "", passwordFile, destination
+  }: pkgs.writeScript "append-ldap-bind-pwd-in-${name}" ''
+    #!${pkgs.stdenv.shell}
+    set -euo pipefail
+
+    baseDir=$(dirname ${destination})
+    if (! test -d "$baseDir"); then
+      mkdir -p $baseDir
+      chmod 755 $baseDir
+    fi
+
+    cat ${file} > ${destination}
+    echo -n '${prefix}' >> ${destination}
+    cat ${passwordFile} >> ${destination}
+    echo -n '${suffix}' >> ${destination}
+    chmod 600 ${destination}
+  '';
+
 }

mail-server/debug.nix

@@ -0,0 +1,4 @@
+{ config, lib, ... }:
+{
+  mailserver.policydSPFExtraConfig = lib.mkIf config.mailserver.debug "debugLevel = 4";
+}

mail-server/dovecot.nix

@@ -23,11 +23,20 @@ let
 
   passwdDir = "/run/dovecot2";
   passwdFile = "${passwdDir}/passwd";
+  userdbFile = "${passwdDir}/userdb";
+  # This file contains the ldap bind password
+  ldapConfFile = "${passwdDir}/dovecot-ldap.conf.ext";
+  bool2int = x: if x then "1" else "0";
 
   maildirLayoutAppendix = lib.optionalString cfg.useFsLayout ":LAYOUT=fs";
+  maildirUTF8FolderNames = lib.optionalString cfg.useUTF8FolderNames ":UTF-8";
 
   # maildir in format "/${domain}/${user}"
-  dovecotMaildir = "maildir:${cfg.mailDirectory}/%d/%n${maildirLayoutAppendix}";
+  dovecotMaildir =
+    "maildir:${cfg.mailDirectory}/%d/%n${maildirLayoutAppendix}${maildirUTF8FolderNames}"
+    + (lib.optionalString (cfg.indexDir != null)
+       ":INDEX=${cfg.indexDir}/%d/%n"
+      );
 
   postfixCfg = config.services.postfix;
   dovecot2Cfg = config.services.dovecot2;
@@ -51,6 +60,42 @@ let
     '';
   };
 
+
+  ldapConfig = pkgs.writeTextFile {
+    name = "dovecot-ldap.conf.ext.template";
+    text = ''
+      ldap_version = 3
+      uris = ${lib.concatStringsSep " " cfg.ldap.uris}
+      ${lib.optionalString cfg.ldap.startTls ''
+      tls = yes
+      ''}
+      tls_require_cert = hard
+      tls_ca_cert_file = ${cfg.ldap.tlsCAFile}
+      dn = ${cfg.ldap.bind.dn}
+      sasl_bind = no
+      auth_bind = yes
+      base = ${cfg.ldap.searchBase}
+      scope = ${mkLdapSearchScope cfg.ldap.searchScope}
+      ${lib.optionalString (cfg.ldap.dovecot.userAttrs != null) ''
+      user_attrs = ${cfg.ldap.dovecot.userAttrs}
+      ''}
+      user_filter = ${cfg.ldap.dovecot.userFilter}
+      ${lib.optionalString (cfg.ldap.dovecot.passAttrs != "") ''
+      pass_attrs = ${cfg.ldap.dovecot.passAttrs}
+      ''}
+      pass_filter = ${cfg.ldap.dovecot.passFilter}
+    '';
+  };
+
+  setPwdInLdapConfFile = appendLdapBindPwd {
+    name = "ldap-conf-file";
+    file = ldapConfig;
+    prefix = ''dnpass = "'';
+    suffix = ''"'';
+    passwordFile = cfg.ldap.bind.passwordFile;
+    destination = ldapConfFile;
+  };
+
   genPasswdScript = pkgs.writeScript "generate-password-file" ''
     #!${pkgs.stdenv.shell}
 
@@ -61,6 +106,9 @@ let
       chmod 755 "${passwdDir}"
     fi
 
+    # Prevent world-readable password files, even temporarily.
+    umask 077
+
     for f in ${builtins.toString (lib.mapAttrsToList (name: value: passwordFiles."${name}") cfg.loginAccounts)}; do
       if [ ! -f "$f" ]; then
         echo "Expected password hash file $f does not exist!"
@@ -70,22 +118,52 @@ let
 
     cat <<EOF > ${passwdFile}
     ${lib.concatStringsSep "\n" (lib.mapAttrsToList (name: value:
-      "${name}:${"$(cat ${passwordFiles."${name}"})"}:${builtins.toString cfg.vmailUID}:${builtins.toString cfg.vmailUID}::${cfg.mailDirectory}:/run/current-system/sw/bin/nologin:"
+      "${name}:${"$(head -n 1 ${passwordFiles."${name}"})"}::::::"
+    ) cfg.loginAccounts)}
+    EOF
+
+    cat <<EOF > ${userdbFile}
+    ${lib.concatStringsSep "\n" (lib.mapAttrsToList (name: value:
+      "${name}:::::::"
         + (if lib.isString value.quota
               then "userdb_quota_rule=*:storage=${value.quota}"
               else "")
     ) cfg.loginAccounts)}
     EOF
-
-    chmod 600 ${passwdFile}
   '';
+
+  junkMailboxes = builtins.attrNames (lib.filterAttrs (n: v: v ? "specialUse" && v.specialUse == "Junk") cfg.mailboxes);
+  junkMailboxNumber = builtins.length junkMailboxes;
+  # The assertion garantees there is exactly one Junk mailbox.
+  junkMailboxName = if junkMailboxNumber == 1 then builtins.elemAt junkMailboxes 0 else "";
+
+  mkLdapSearchScope = scope: (
+    if scope == "sub" then "subtree"
+    else if scope == "one" then "onelevel"
+    else scope
+  );
+
 in
 {
   config = with cfg; lib.mkIf enable {
+    assertions = [
+      {
+        assertion = junkMailboxNumber == 1;
+        message = "nixos-mailserver requires exactly one dovecot mailbox with the 'special use' flag set to 'Junk' (${builtins.toString junkMailboxNumber} have been found)";
+      }
+    ];
+
+    # for sieve-test. Shelling it in on demand usually doesnt' work, as it reads
+    # the global config and tries to open shared libraries configured in there,
+    # which are usually not compatible.
+    environment.systemPackages = [
+      pkgs.dovecot_pigeonhole
+    ];
+
     services.dovecot2 = {
       enable = true;
-      enableImap = enableImap;
+      enableImap = enableImap || enableImapSsl;
-      enablePop3 = enablePop3;
+      enablePop3 = enablePop3 || enablePop3Ssl;
       enablePAM = false;
       enableQuota = true;
       mailGroup = vmailGroupName;
@@ -94,20 +172,52 @@ in
       sslServerCert = certificatePath;
       sslServerKey = keyPath;
       enableLmtp = true;
-      modules = [ pkgs.dovecot_pigeonhole ];
+      modules = [ pkgs.dovecot_pigeonhole ] ++ (lib.optional cfg.fullTextSearch.enable pkgs.dovecot_fts_xapian );
-      protocols = [ "sieve" ];
+      mailPlugins.globally.enable = lib.optionals cfg.fullTextSearch.enable [ "fts" "fts_xapian" ];
+      protocols = lib.optional cfg.enableManageSieve "sieve";
 
-      sieveScripts = {
+      pluginSettings = {
-        after = builtins.toFile "spam.sieve" ''
+        sieve = "file:${cfg.sieveDirectory}/%u/scripts;active=${cfg.sieveDirectory}/%u/active.sieve";
+        sieve_default = "file:${cfg.sieveDirectory}/%u/default.sieve";
+        sieve_default_name = "default";
+      };
+
+      sieve = {
+        extensions = [
+          "fileinto"
+        ];
+
+        scripts.after = builtins.toFile "spam.sieve" ''
           require "fileinto";
 
           if header :is "X-Spam" "Yes" {
-              fileinto "Junk";
+              fileinto "${junkMailboxName}";
               stop;
           }
         '';
+
+        pipeBins = map lib.getExe [
+          (pkgs.writeShellScriptBin "sa-learn-ham.sh"
+            "exec ${pkgs.rspamd}/bin/rspamc -h /run/rspamd/worker-controller.sock learn_ham")
+          (pkgs.writeShellScriptBin "sa-learn-spam.sh"
+            "exec ${pkgs.rspamd}/bin/rspamc -h /run/rspamd/worker-controller.sock learn_spam")
+        ];
       };
 
+      imapsieve.mailbox = [
+        {
+          name = junkMailboxName;
+          causes = [ "COPY" "APPEND" ];
+          before = ./dovecot/imap_sieve/report-spam.sieve;
+        }
+        {
+          name = "*";
+          from = junkMailboxName;
+          causes = [ "COPY" ];
+          before = ./dovecot/imap_sieve/report-ham.sieve;
+        }
+      ];
+
       mailboxes = cfg.mailboxes;
 
       extraConfig = ''
@@ -118,6 +228,49 @@ in
           verbose_ssl = yes
         ''}
 
+        ${lib.optionalString (cfg.enableImap || cfg.enableImapSsl) ''
+          service imap-login {
+            inet_listener imap {
+              ${if cfg.enableImap then ''
+                port = 143
+              '' else ''
+                # see https://dovecot.org/pipermail/dovecot/2010-March/047479.html
+                port = 0
+              ''}
+            }
+            inet_listener imaps {
+              ${if cfg.enableImapSsl then ''
+                port = 993
+                ssl = yes
+              '' else ''
+                # see https://dovecot.org/pipermail/dovecot/2010-March/047479.html
+                port = 0
+              ''}
+            }
+          }
+        ''}
+        ${lib.optionalString (cfg.enablePop3 || cfg.enablePop3Ssl) ''
+          service pop3-login {
+            inet_listener pop3 {
+              ${if cfg.enablePop3 then ''
+                port = 110
+              '' else ''
+                # see https://dovecot.org/pipermail/dovecot/2010-March/047479.html
+                port = 0
+              ''}
+            }
+            inet_listener pop3s {
+              ${if cfg.enablePop3Ssl then ''
+                port = 995
+                ssl = yes
+              '' else ''
+                # see https://dovecot.org/pipermail/dovecot/2010-March/047479.html
+                port = 0
+              ''}
+            }
+          }
+        ''}
+
         protocol imap {
           mail_max_userip_connections = ${toString cfg.maxConnectionsPerUser}
           mail_plugins = $mail_plugins imap_sieve
@@ -129,6 +282,8 @@ in
 
         mail_access_groups = ${vmailGroupName}
         ssl = required
+        ssl_min_protocol = TLSv1.2
+        ssl_prefer_server_ciphers = yes
 
         service lmtp {
           unix_listener dovecot-lmtp {
@@ -138,8 +293,8 @@ in
           }
         }
 
-        recipient_delimiter = +
+        recipient_delimiter = ${cfg.recipientDelimiter}
-        lmtp_save_to_detail_mailbox = ${cfg.lmptSaveToDetailMailbox}
+        lmtp_save_to_detail_mailbox = ${cfg.lmtpSaveToDetailMailbox}
 
         protocol lmtp {
           mail_plugins = $mail_plugins sieve
@@ -152,9 +307,23 @@ in
 
         userdb {
           driver = passwd-file
-          args = ${passwdFile}
+          args = ${userdbFile}
+          default_fields = uid=${builtins.toString cfg.vmailUID} gid=${builtins.toString cfg.vmailUID} home=${cfg.mailDirectory}
         }
 
+        ${lib.optionalString cfg.ldap.enable ''
+        passdb {
+          driver = ldap
+          args = ${ldapConfFile}
+        }
+
+        userdb {
+          driver = ldap
+          args = ${ldapConfFile}
+          default_fields = home=/var/vmail/ldap/%u uid=${toString cfg.vmailUID} gid=${toString cfg.vmailUID}
+        }
+        ''}
+
         service auth {
           unix_listener auth {
             mode = 0660
@@ -170,55 +339,61 @@ in
           inbox = yes
         }
 
+        ${lib.optionalString cfg.fullTextSearch.enable ''
         plugin {
-          sieve_plugins = sieve_imapsieve sieve_extprograms
+          plugin = fts fts_xapian
-          sieve = file:/var/sieve/%u/scripts;active=/var/sieve/%u/active.sieve
+          fts = xapian
-          sieve_default = file:/var/sieve/%u/default.sieve
+          fts_xapian = partial=${toString cfg.fullTextSearch.minSize} full=${toString cfg.fullTextSearch.maxSize} attachments=${bool2int cfg.fullTextSearch.indexAttachments} verbose=${bool2int cfg.debug}
-          sieve_default_name = default
 
-          # From elsewhere to Spam folder
+          fts_autoindex = ${if cfg.fullTextSearch.autoIndex then "yes" else "no"}
-          imapsieve_mailbox1_name = Junk
-          imapsieve_mailbox1_causes = COPY
-          imapsieve_mailbox1_before = file:${stateDir}/imap_sieve/report-spam.sieve
 
-          # From Spam folder to elsewhere
+          ${lib.strings.concatImapStringsSep "\n" (n: x: "fts_autoindex_exclude${if n==1 then "" else toString n} = ${x}") cfg.fullTextSearch.autoIndexExclude}
-          imapsieve_mailbox2_name = *
-          imapsieve_mailbox2_from = Junk
-          imapsieve_mailbox2_causes = COPY
-          imapsieve_mailbox2_before = file:${stateDir}/imap_sieve/report-ham.sieve
 
-          sieve_pipe_bin_dir = ${pipeBin}/pipe/bin
+          fts_enforced = ${cfg.fullTextSearch.enforced}
-
-          sieve_global_extensions = +vnd.dovecot.pipe +vnd.dovecot.environment
         }
 
+        ${lib.optionalString (cfg.fullTextSearch.memoryLimit != null) ''
+        service indexer-worker {
+          vsz_limit = ${toString (cfg.fullTextSearch.memoryLimit*1024*1024)}
+        }
+        ''}
+        ''}
+
         lda_mailbox_autosubscribe = yes
         lda_mailbox_autocreate = yes
       '';
     };
 
-    systemd.services.gen-passwd-file = {
+    systemd.services.dovecot2 = {
+      preStart = ''
+        ${genPasswdScript}
+      '' + (lib.optionalString cfg.ldap.enable setPwdInLdapConfFile);
+    };
+
+    systemd.services.postfix.restartTriggers = [ genPasswdScript ] ++ (lib.optional cfg.ldap.enable [setPwdInLdapConfFile]);
+
+    systemd.services.dovecot-fts-xapian-optimize = lib.mkIf (cfg.fullTextSearch.enable && cfg.fullTextSearch.maintenance.enable) {
+      description = "Optimize dovecot indices for fts_xapian";
+      requisite = [ "dovecot2.service" ];
+      after = [ "dovecot2.service" ];
+      startAt = cfg.fullTextSearch.maintenance.onCalendar;
       serviceConfig = {
-        ExecStart = genPasswdScript;
         Type = "oneshot";
+        ExecStart = "${pkgs.dovecot}/bin/doveadm fts optimize -A";
+        PrivateDevices = true;
+        PrivateNetwork = true;
+        ProtectKernelTunables = true;
+        ProtectKernelModules = true;
+        ProtectControlGroups = true;
+        ProtectHome = true;
+        ProtectSystem = true;
+        PrivateTmp = true;
       };
     };
-
+    systemd.timers.dovecot-fts-xapian-optimize = lib.mkIf (cfg.fullTextSearch.enable && cfg.fullTextSearch.maintenance.enable && cfg.fullTextSearch.maintenance.randomizedDelaySec != 0) {
-    systemd.services.dovecot2 = {
+      timerConfig = {
-      after = [ "gen-passwd-file.service" ];
+        RandomizedDelaySec = cfg.fullTextSearch.maintenance.randomizedDelaySec;
-      wants = [ "gen-passwd-file.service" ];
+      };
-      requires = [ "gen-passwd-file.service" ];
-      preStart = ''
-        rm -rf '${stateDir}/imap_sieve'
-        mkdir '${stateDir}/imap_sieve'
-        cp -p "${./dovecot/imap_sieve}"/*.sieve '${stateDir}/imap_sieve/'
-        for k in "${stateDir}/imap_sieve"/*.sieve ; do
-          ${pkgs.dovecot_pigeonhole}/bin/sievec "$k"
-        done
-        chown -R '${dovecot2Cfg.mailUser}:${dovecot2Cfg.mailGroup}' '${stateDir}/imap_sieve'
-      '';
     };
-
-    systemd.services.postfix.restartTriggers = [ passwdFile ];
   };
 }

mail-server/environment.nix

@@ -23,6 +23,6 @@ in
   config = with cfg; lib.mkIf enable {
     environment.systemPackages = with pkgs; [
       dovecot opendkim openssh postfix rspamd
-    ] ++ (if certificateScheme == 2 then [ openssl ] else []);
+    ] ++ (if certificateScheme == "selfsigned" then [ openssl ] else []);
   };
 }

mail-server/kresd.nix

@@ -22,7 +22,6 @@ in
 {
   config = lib.mkIf (cfg.enable && cfg.localDnsResolver) {
     services.kresd.enable = true;
-    networking.nameservers = [ "127.0.0.1" ];
   };
 }
 

mail-server/networking.nix

@@ -14,22 +14,24 @@
 #  You should have received a copy of the GNU General Public License
 #  along with this program. If not, see <http://www.gnu.org/licenses/>
 
-{ config, pkgs, lib, ... }:
+{ config, lib, ... }:
 
 let
   cfg = config.mailserver;
 in
 {
-  config = with cfg; lib.mkIf enable {
+  config = with cfg; lib.mkIf (enable && openFirewall) {
 
     networking.firewall = {
-      allowedTCPPorts = [ 25 587 ]
+      allowedTCPPorts = [ 25 ]
+        ++ lib.optional enableSubmission 587
+        ++ lib.optional enableSubmissionSsl 465
         ++ lib.optional enableImap 143
         ++ lib.optional enableImapSsl 993
         ++ lib.optional enablePop3 110
         ++ lib.optional enablePop3Ssl 995
         ++ lib.optional enableManageSieve 4190
-        ++ lib.optional (certificateScheme == 3) 80;
+        ++ lib.optional (certificateScheme == "acme-nginx") 80;
     };
   };
 }

mail-server/nginx.nix

@@ -17,28 +17,26 @@
 
 { config, pkgs, lib, ... }:
 
-with (import ./common.nix { inherit config; });
+with (import ./common.nix { inherit config lib pkgs; });
 
 let
   cfg = config.mailserver;
-  acmeRoot = "/var/lib/acme/acme-challenge";
 in
 {
-  config = lib.mkIf (cfg.enable && cfg.certificateScheme == 3) {
+  config = lib.mkIf (cfg.enable && (cfg.certificateScheme == "acme" || cfg.certificateScheme == "acme-nginx")) {
-    services.nginx = {
+    services.nginx = lib.mkIf (cfg.certificateScheme == "acme-nginx") {
       enable = true;
       virtualHosts."${cfg.fqdn}" = {
         serverName = cfg.fqdn;
+        serverAliases = cfg.certificateDomains;
         forceSSL = true;
         enableACME = true;
-        acmeRoot = acmeRoot;
       };
     };
 
-    security.acme.certs."${cfg.fqdn}".postRun = ''
+    security.acme.certs."${cfg.acmeCertificateName}".reloadServices = [
-      systemctl reload nginx
+      "postfix.service"
-      systemctl reload postfix
+      "dovecot2.service"
-      systemctl reload dovecot2
+    ];
-    '';
   };
 }

mail-server/opendkim.nix

@@ -29,7 +29,7 @@ let
       dkim_txt = "${cfg.dkimKeyDirectory}/${dom}.${cfg.dkimSelector}.txt";
     in
         ''
-          if [ ! -f "${dkim_key}" ] || [ ! -f "${dkim_txt}" ]
+          if [ ! -f "${dkim_key}" ]
           then
               ${pkgs.opendkim}/bin/opendkim-genkey -s "${cfg.dkimSelector}" \
                                                    -d "${dom}" \
@@ -37,6 +37,7 @@ let
                                                    --directory="${cfg.dkimKeyDirectory}"
               mv "${cfg.dkimKeyDirectory}/${cfg.dkimSelector}.private" "${dkim_key}"
               mv "${cfg.dkimKeyDirectory}/${cfg.dkimSelector}.txt" "${dkim_txt}"
+              chmod 644 "${dkim_txt}"
               echo "Generated key for domain ${dom} selector ${cfg.dkimSelector}"
           fi
         '';
@@ -56,9 +57,10 @@ in
       services.opendkim = {
         enable = true;
         selector = cfg.dkimSelector;
+        keyPath = cfg.dkimKeyDirectory;
         domains = "csl:${builtins.concatStringsSep "," cfg.domains}";
         configFile = pkgs.writeText "opendkim.conf" (''
-          Canonicalization relaxed/simple
+          Canonicalization ${cfg.dkimHeaderCanonicalization}/${cfg.dkimBodyCanonicalization}
           UMask 0002
           Socket ${dkim.socket}
           KeyTable file:${keyTable}

mail-server/postfix.nix

@@ -22,33 +22,57 @@ let
   inherit (lib.strings) concatStringsSep;
   cfg = config.mailserver;
 
-  # valiases_postfix :: [ String ]
+  # Merge several lookup tables. A lookup table is a attribute set where
-  valiases_postfix = lib.flatten (lib.mapAttrsToList
+  # - the key is an address (user@example.com) or a domain (@example.com)
+  # - the value is a list of addresses
+  mergeLookupTables = tables: lib.zipAttrsWith (n: v: lib.flatten v) tables;
+
+  # valiases_postfix :: Map String [String]
+  valiases_postfix = mergeLookupTables (lib.flatten (lib.mapAttrsToList
     (name: value:
       let to = name;
-          in map (from: "${from} ${to}") (value.aliases ++ lib.singleton name))
+      in map (from: {"${from}" = to;}) (value.aliases ++ lib.singleton name))
-    cfg.loginAccounts);
+    cfg.loginAccounts));
-
+  regex_valiases_postfix = mergeLookupTables (lib.flatten (lib.mapAttrsToList
-  # catchAllPostfix :: [ String ]
-  catchAllPostfix = lib.flatten (lib.mapAttrsToList
     (name: value:
       let to = name;
-          in map (from: "@${from} ${to}") value.catchAll)
+      in map (from: {"${from}" = to;}) value.aliasesRegexp)
-    cfg.loginAccounts);
+    cfg.loginAccounts));
 
-  # extra_valiases_postfix :: [ String ]
+  # catchAllPostfix :: Map String [String]
-  extra_valiases_postfix =
+  catchAllPostfix =  mergeLookupTables (lib.flatten (lib.mapAttrsToList
-    (map
+    (name: value:
-    (from:
+      let to = name;
-      let to = cfg.extraVirtualAliases.${from};
+      in map (from: {"@${from}" = to;}) value.catchAll)
-          aliasList = (l: let aliasStr = builtins.foldl' (x: y: x + y + ", ") "" l;
+      cfg.loginAccounts));
-                          in builtins.substring 0 (builtins.stringLength aliasStr - 2) aliasStr);
-      in if (builtins.isList to) then "${from} " + (aliasList to)
-                                 else "${from} ${to}")
-    (builtins.attrNames cfg.extraVirtualAliases));
 
-  # all_valiases_postfix :: [ String ]
+  # all_valiases_postfix :: Map String [String]
-  all_valiases_postfix = valiases_postfix ++ extra_valiases_postfix;
+  all_valiases_postfix = mergeLookupTables [valiases_postfix extra_valiases_postfix];
+
+  # attrsToLookupTable :: Map String (Either String [ String ]) -> Map String [String]
+  attrsToLookupTable = aliases: let
+    lookupTables = lib.mapAttrsToList (from: to: {"${from}" = to;}) aliases;
+  in mergeLookupTables lookupTables;
+
+  # extra_valiases_postfix :: Map String [String]
+  extra_valiases_postfix = attrsToLookupTable cfg.extraVirtualAliases;
+
+  # forwards :: Map String [String]
+  forwards = attrsToLookupTable cfg.forwards;
+
+  # lookupTableToString :: Map String [String] -> String
+  lookupTableToString = attrs: let
+    valueToString = value: lib.concatStringsSep ", " value;
+  in lib.concatStringsSep "\n" (lib.mapAttrsToList (name: value: "${name} ${valueToString value}") attrs);
+
+  # valiases_file :: Path
+  valiases_file = let
+    content = lookupTableToString (mergeLookupTables [all_valiases_postfix catchAllPostfix]);
+  in builtins.toFile "valias" content;
+
+  regex_valiases_file = let
+    content = lookupTableToString regex_valiases_postfix;
+  in builtins.toFile "regex_valias" content;
 
   # denied_recipients_postfix :: [ String ]
   denied_recipients_postfix = (map
@@ -56,19 +80,12 @@ let
     (lib.filter (acct: acct.sendOnly) (lib.attrValues cfg.loginAccounts)));
   denied_recipients_file = builtins.toFile "denied_recipients" (lib.concatStringsSep "\n" denied_recipients_postfix);
 
-
-  # valiases_file :: Path
-  valiases_file = builtins.toFile "valias"
-                      (lib.concatStringsSep "\n" (all_valiases_postfix ++
-                                                  catchAllPostfix));
-
   reject_senders_postfix = (map
     (sender:
       "${sender} REJECT")
     (cfg.rejectSender));
   reject_senders_file = builtins.toFile "reject_senders" (lib.concatStringsSep "\n" (reject_senders_postfix))  ;
 
-
   reject_recipients_postfix = (map
     (recipient:
       "${recipient} REJECT")
@@ -85,7 +102,8 @@ let
   # for details on how this file looks. By using the same file as valiases,
   # every alias is owned (uniquely) by its user.
   # The user's own address is already in all_valiases_postfix.
-  vaccounts_file = builtins.toFile "vaccounts" (lib.concatStringsSep "\n" all_valiases_postfix);
+  vaccounts_file = builtins.toFile "vaccounts" (lookupTableToString all_valiases_postfix);
+  regex_vaccounts_file = builtins.toFile "regex_vaccounts" (lookupTableToString regex_valiases_postfix);
 
   submissionHeaderCleanupRules = pkgs.writeText "submission_header_cleanup_rules" (''
      # Removes sensitive headers from mails handed in via the submission port.
@@ -112,128 +130,202 @@ let
    (lib.optional cfg.dkimSigning "unix:/run/opendkim/opendkim.sock")
    ++ [ "unix:/run/rspamd/rspamd-milter.sock" ];
 
-  policyd-spf = pkgs.writeText "policyd-spf.conf" (
+  policyd-spf = pkgs.writeText "policyd-spf.conf" cfg.policydSPFExtraConfig;
-    cfg.policydSPFExtraConfig
-    + (lib.optionalString cfg.debug ''
-    debugLevel = 4
-  ''));
 
   mappedFile = name: "hash:/var/lib/postfix/conf/${name}";
+  mappedRegexFile = name: "pcre:/var/lib/postfix/conf/${name}";
+
+  submissionOptions =
+    {
+      smtpd_tls_security_level = "encrypt";
+      smtpd_sasl_auth_enable = "yes";
+      smtpd_sasl_type = "dovecot";
+      smtpd_sasl_path = "/run/dovecot2/auth";
+      smtpd_sasl_security_options = "noanonymous";
+      smtpd_sasl_local_domain = "$myhostname";
+      smtpd_client_restrictions = "permit_sasl_authenticated,reject";
+      smtpd_sender_login_maps = "hash:/etc/postfix/vaccounts${lib.optionalString cfg.ldap.enable ",ldap:${ldapSenderLoginMapFile}"}${lib.optionalString (regex_valiases_postfix != {}) ",pcre:/etc/postfix/regex_vaccounts"}";
+      smtpd_sender_restrictions = "reject_sender_login_mismatch";
+      smtpd_recipient_restrictions = "reject_non_fqdn_recipient,reject_unknown_recipient_domain,permit_sasl_authenticated,reject";
+      cleanup_service_name = "submission-header-cleanup";
+    };
+
+  commonLdapConfig = ''
+    server_host = ${lib.concatStringsSep " " cfg.ldap.uris}
+    start_tls = ${if cfg.ldap.startTls then "yes" else "no"}
+    version = 3
+    tls_ca_cert_file = ${cfg.ldap.tlsCAFile}
+    tls_require_cert = yes
+
+    search_base = ${cfg.ldap.searchBase}
+    scope = ${cfg.ldap.searchScope}
+
+    bind = yes
+    bind_dn = ${cfg.ldap.bind.dn}
+  '';
+
+  ldapSenderLoginMap = pkgs.writeText "ldap-sender-login-map.cf" ''
+    ${commonLdapConfig}
+    query_filter = ${cfg.ldap.postfix.filter}
+    result_attribute = ${cfg.ldap.postfix.mailAttribute}
+  '';
+  ldapSenderLoginMapFile = "/run/postfix/ldap-sender-login-map.cf";
+  appendPwdInSenderLoginMap = appendLdapBindPwd {
+    name = "ldap-sender-login-map";
+    file = ldapSenderLoginMap;
+    prefix = "bind_pw = ";
+    passwordFile = cfg.ldap.bind.passwordFile;
+    destination = ldapSenderLoginMapFile;
+  };
+
+  ldapVirtualMailboxMap = pkgs.writeText "ldap-virtual-mailbox-map.cf" ''
+    ${commonLdapConfig}
+    query_filter = ${cfg.ldap.postfix.filter}
+    result_attribute = ${cfg.ldap.postfix.uidAttribute}
+  '';
+  ldapVirtualMailboxMapFile = "/run/postfix/ldap-virtual-mailbox-map.cf";
+  appendPwdInVirtualMailboxMap = appendLdapBindPwd {
+    name = "ldap-virtual-mailbox-map";
+    file = ldapVirtualMailboxMap;
+    prefix = "bind_pw = ";
+    passwordFile = cfg.ldap.bind.passwordFile;
+    destination = ldapVirtualMailboxMapFile;
+  };
 in
 {
   config = with cfg; lib.mkIf enable {
 
+    systemd.services.postfix-setup = lib.mkIf cfg.ldap.enable {
+      preStart = ''
+        ${appendPwdInVirtualMailboxMap}
+        ${appendPwdInSenderLoginMap}
+      '';
+      restartTriggers = [ appendPwdInVirtualMailboxMap appendPwdInSenderLoginMap ];
+    };
+
     services.postfix = {
       enable = true;
-      hostname = "${fqdn}";
+      hostname = "${sendingFqdn}";
       networksStyle = "host";
       mapFiles."valias" = valiases_file;
+      mapFiles."regex_valias" = regex_valiases_file;
       mapFiles."vaccounts" = vaccounts_file;
+      mapFiles."regex_vaccounts" = regex_vaccounts_file;
       mapFiles."denied_recipients" = denied_recipients_file;
       mapFiles."reject_senders" = reject_senders_file;
       mapFiles."reject_recipients" = reject_recipients_file;
       sslCert = certificatePath;
       sslKey = keyPath;
-      enableSubmission = true;
+      enableSubmission = cfg.enableSubmission;
-      virtual =
+      enableSubmissions = cfg.enableSubmissionSsl;
-        (lib.concatStringsSep "\n" (all_valiases_postfix ++ catchAllPostfix));
+      virtual = lookupTableToString (mergeLookupTables [all_valiases_postfix catchAllPostfix forwards]);
 
-      extraConfig =
+      config = {
-      ''
         # Extra Config
-        mydestination =
+        mydestination = "";
-        recipient_delimiter = +
+        recipient_delimiter = cfg.recipientDelimiter;
-        smtpd_banner = ${fqdn} ESMTP NO UCE
+        smtpd_banner = "${fqdn} ESMTP NO UCE";
-        disable_vrfy_command = yes
+        disable_vrfy_command = true;
-        message_size_limit = ${builtins.toString cfg.messageSizeLimit}
+        message_size_limit = toString cfg.messageSizeLimit;
 
         # virtual mail system
-        virtual_uid_maps = static:5000
+        virtual_uid_maps = "static:5000";
-        virtual_gid_maps = static:5000
+        virtual_gid_maps = "static:5000";
-        virtual_mailbox_base = ${mailDirectory}
+        virtual_mailbox_base = mailDirectory;
-        virtual_mailbox_domains = ${vhosts_file}
+        virtual_mailbox_domains = vhosts_file;
-        virtual_mailbox_maps = ${mappedFile "valias"}
+        virtual_mailbox_maps = [
-        virtual_transport = lmtp:unix:/run/dovecot2/dovecot-lmtp
+          (mappedFile "valias")
+        ] ++ lib.optionals (cfg.ldap.enable) [
+          "ldap:${ldapVirtualMailboxMapFile}"
+        ] ++ lib.optionals (regex_valiases_postfix != {}) [
+          (mappedRegexFile "regex_valias")
+        ];
+        virtual_alias_maps = lib.mkAfter (lib.optionals (regex_valiases_postfix != {}) [
+          (mappedRegexFile "regex_valias")
+        ]);
+        virtual_transport = "lmtp:unix:/run/dovecot2/dovecot-lmtp";
+        # Avoid leakage of X-Original-To, X-Delivered-To headers between recipients
+        lmtp_destination_recipient_limit = "1";
 
         # sasl with dovecot
-        smtpd_sasl_type = dovecot
+        smtpd_sasl_type = "dovecot";
-        smtpd_sasl_path = /run/dovecot2/auth
+        smtpd_sasl_path = "/run/dovecot2/auth";
-        smtpd_sasl_auth_enable = yes
+        smtpd_sasl_auth_enable = true;
-        smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
+        smtpd_relay_restrictions = [
+          "permit_mynetworks" "permit_sasl_authenticated" "reject_unauth_destination"
+        ];
 
-        policy-spf_time_limit = 3600s
+        policy-spf_time_limit = "3600s";
 
         # reject selected senders
-        smtpd_sender_restrictions = check_sender_access ${mappedFile "reject_senders"}
+        smtpd_sender_restrictions = [
+          "check_sender_access ${mappedFile "reject_senders"}"
+        ];
 
         # quota and spf checking
-        smtpd_recipient_restrictions =
+        smtpd_recipient_restrictions = [
-          check_recipient_access ${mappedFile "denied_recipients"},
+          "check_recipient_access ${mappedFile "denied_recipients"}"
-          check_recipient_access ${mappedFile "reject_recipients"},
+          "check_recipient_access ${mappedFile "reject_recipients"}"
-          check_policy_service inet:localhost:12340,
+          "check_policy_service inet:localhost:12340"
-          check_policy_service unix:private/policy-spf
+          "check_policy_service unix:private/policy-spf"
+        ];
 
         # TLS settings, inspired by https://github.com/jeaye/nix-files
         # Submission by mail clients is handled in submissionOptions
-        smtpd_tls_security_level = may
+        smtpd_tls_security_level = "may";
-
-        # strong might suffice and is computationally less expensive
-        smtpd_tls_eecdh_grade = ultra
 
         # Disable obselete protocols
-        smtpd_tls_protocols = TLSv1.2, TLSv1.1, !TLSv1, !SSLv2, !SSLv3
+        smtpd_tls_protocols = "TLSv1.3, TLSv1.2, TLSv1.1, !TLSv1, !SSLv2, !SSLv3";
-        smtp_tls_protocols = TLSv1.2, TLSv1.1, !TLSv1, !SSLv2, !SSLv3
+        smtp_tls_protocols = "TLSv1.3, TLSv1.2, TLSv1.1, !TLSv1, !SSLv2, !SSLv3";
-        smtpd_tls_mandatory_protocols = TLSv1.2, TLSv1.1, !TLSv1, !SSLv2, !SSLv3
+        smtpd_tls_mandatory_protocols = "TLSv1.3, TLSv1.2, TLSv1.1, !TLSv1, !SSLv2, !SSLv3";
-        smtp_tls_mandatory_protocols = TLSv1.2, TLSv1.1, !TLSv1, !SSLv2, !SSLv3
+        smtp_tls_mandatory_protocols = "TLSv1.3, TLSv1.2, TLSv1.1, !TLSv1, !SSLv2, !SSLv3";
 
-        smtp_tls_ciphers = high
+        smtp_tls_ciphers = "high";
-        smtpd_tls_ciphers = high
+        smtpd_tls_ciphers = "high";
-        smtp_tls_mandatory_ciphers = high
+        smtp_tls_mandatory_ciphers = "high";
-        smtpd_tls_mandatory_ciphers = high
+        smtpd_tls_mandatory_ciphers = "high";
 
         # Disable deprecated ciphers
-        smtpd_tls_mandatory_exclude_ciphers = MD5, DES, ADH, RC4, PSD, SRP, 3DES, eNULL, aNULL
+        smtpd_tls_mandatory_exclude_ciphers = "MD5, DES, ADH, RC4, PSD, SRP, 3DES, eNULL, aNULL";
-        smtpd_tls_exclude_ciphers = MD5, DES, ADH, RC4, PSD, SRP, 3DES, eNULL, aNULL
+        smtpd_tls_exclude_ciphers = "MD5, DES, ADH, RC4, PSD, SRP, 3DES, eNULL, aNULL";
-        smtp_tls_mandatory_exclude_ciphers = MD5, DES, ADH, RC4, PSD, SRP, 3DES, eNULL, aNULL
+        smtp_tls_mandatory_exclude_ciphers = "MD5, DES, ADH, RC4, PSD, SRP, 3DES, eNULL, aNULL";
-        smtp_tls_exclude_ciphers = MD5, DES, ADH, RC4, PSD, SRP, 3DES, eNULL, aNULL
+        smtp_tls_exclude_ciphers = "MD5, DES, ADH, RC4, PSD, SRP, 3DES, eNULL, aNULL";
 
-        tls_preempt_cipherlist = yes
+        tls_preempt_cipherlist = true;
 
         # Allowing AUTH on a non encrypted connection poses a security risk
-        smtpd_tls_auth_only = yes
+        smtpd_tls_auth_only = true;
         # Log only a summary message on TLS handshake completion
-        smtpd_tls_loglevel = 1
+        smtpd_tls_loglevel = "1";
 
         # Configure a non blocking source of randomness
-        tls_random_source = dev:/dev/urandom
+        tls_random_source = "dev:/dev/urandom";
 
-        smtpd_milters = ${lib.concatStringsSep "," smtpdMilters}
+        smtpd_milters = smtpdMilters;
-        ${lib.optionalString cfg.dkimSigning "non_smtpd_milters = unix:/run/opendkim/opendkim.sock"}
+        non_smtpd_milters = lib.mkIf cfg.dkimSigning ["unix:/run/opendkim/opendkim.sock"];
-        milter_protocol = 6
+        milter_protocol = "6";
-        milter_mail_macros = i {mail_addr} {client_addr} {client_name} {auth_type} {auth_authen} {auth_author} {mail_addr} {mail_host} {mail_mailer}
+        milter_mail_macros = "i {mail_addr} {client_addr} {client_name} {auth_type} {auth_authen} {auth_author} {mail_addr} {mail_host} {mail_mailer}";
-      '';
 
-      submissionOptions =
+        # Fix for https://www.postfix.org/smtp-smuggling.html
-      {
+        smtpd_forbid_bare_newline = cfg.smtpdForbidBareNewline;
-        smtpd_tls_security_level = "encrypt";
+        smtpd_forbid_bare_newline_exclusions = "$mynetworks";
-        smtpd_sasl_auth_enable = "yes";
-        smtpd_sasl_type = "dovecot";
-        smtpd_sasl_path = "/run/dovecot2/auth";
-        smtpd_sasl_security_options = "noanonymous";
-        smtpd_sasl_local_domain = "$myhostname";
-        smtpd_client_restrictions = "permit_sasl_authenticated,reject";
-        smtpd_sender_login_maps = "hash:/etc/postfix/vaccounts";
-        smtpd_sender_restrictions = "reject_sender_login_mismatch";
-        smtpd_recipient_restrictions = "reject_non_fqdn_recipient,reject_unknown_recipient_domain,permit_sasl_authenticated,reject";
-        cleanup_service_name = "submission-header-cleanup";
       };
+
+      submissionOptions = submissionOptions;
+      submissionsOptions = submissionOptions;
+
       masterConfig = {
+        "lmtp" = {
+          # Add headers when delivering, see http://www.postfix.org/smtp.8.html
+          # D => Delivered-To, O => X-Original-To, R => Return-Path
+          args = [ "flags=O" ];
+        };
         "policy-spf" = {
           type = "unix";
           privileged = true;
           chroot = false;
           command = "spawn";
-          args = [ "user=nobody" "argv=${pkgs.pypolicyd-spf}/bin/policyd-spf" "${policyd-spf}"];
+          args = [ "user=nobody" "argv=${pkgs.spf-engine}/bin/policyd-spf" "${policyd-spf}"];
         };
         "submission-header-cleanup" = {
           type = "unix";

mail-server/rspamd.nix

@@ -30,7 +30,7 @@ in
       inherit debug;
       locals = {
           "milter_headers.conf" = { text = ''
-              extended_spam_headers = yes;
+              extended_spam_headers = true;
           ''; };
           "redis.conf" = { text = ''
               servers = "${cfg.redis.address}:${toString cfg.redis.port}";
@@ -52,14 +52,21 @@ in
                 scan_mime_parts = false; # scan mail as a whole unit, not parts. seems to be needed to work at all
               }
           ''; };
-      };
+          "dkim_signing.conf" = { text = ''
-
+              # Disable outbound email signing, we use opendkim for this
-      overrides = {
+              enabled = false;
-        "milter_headers.conf" = {
+          ''; };
-          text = ''
+          "dmarc.conf" = { text = ''
-            extended_spam_headers = true;
+              ${lib.optionalString cfg.dmarcReporting.enable ''
-          '';
+              reporting {
-        };
+                enabled = true;
+                email = "${cfg.dmarcReporting.email}";
+                domain = "${cfg.dmarcReporting.domain}";
+                org_name = "${cfg.dmarcReporting.organizationName}";
+                from_name = "${cfg.dmarcReporting.fromName}";
+                msgid_from = "dmarc-rua";
+              }''}
+          ''; };
       };
 
       workers.rspamd_proxy = {
@@ -87,15 +94,79 @@ in
           mode = "0666";
         }];
         includes = [];
+        extraConfig = ''
+          static_dir = "''${WWWDIR}"; # Serve the web UI static assets
+        '';
       };
 
     };
 
-    services.redis.enable = true;
+    services.redis.servers.rspamd = {
+      enable = lib.mkDefault true;
+      port = lib.mkDefault 6380;
+    };
 
     systemd.services.rspamd = {
-      requires = [ "redis.service" ] ++ (lib.optional cfg.virusScanning "clamav-daemon.service");
+      requires = [ "redis-rspamd.service" ] ++ (lib.optional cfg.virusScanning "clamav-daemon.service");
-      after = [ "redis.service" ] ++ (lib.optional cfg.virusScanning "clamav-daemon.service");
+      after = [ "redis-rspamd.service" ] ++ (lib.optional cfg.virusScanning "clamav-daemon.service");
+    };
+
+    systemd.services.rspamd-dmarc-reporter = lib.optionalAttrs (cfg.dmarcReporting.enable) {
+      # Explicitly select yesterday's date to work around broken
+      # default behaviour when called without a date.
+      # https://github.com/rspamd/rspamd/issues/4062
+      script = ''
+        ${pkgs.rspamd}/bin/rspamadm dmarc_report $(date -d "yesterday" "+%Y%m%d")
+      '';
+      serviceConfig = {
+        User = "${config.services.rspamd.user}";
+        Group = "${config.services.rspamd.group}";
+
+        AmbientCapabilities = [];
+        CapabilityBoundingSet = "";
+        DevicePolicy = "closed";
+        IPAddressAllow = "localhost";
+        LockPersonality = true;
+        NoNewPrivileges = true;
+        PrivateDevices = true;
+        PrivateMounts = true;
+        PrivateTmp = true;
+        PrivateUsers = true;
+        ProtectClock = true;
+        ProtectControlGroups = true;
+        ProtectHome = true;
+        ProtectHostname = true;
+        ProtectKernelLogs = true;
+        ProtectKernelModules = true;
+        ProtectKernelTunables = true;
+        ProtectProc = "invisible";
+        ProcSubset = "pid";
+        ProtectSystem = "strict";
+        RemoveIPC = true;
+        RestrictAddressFamilies = [ "AF_INET" "AF_INET6" ];
+        RestrictNamespaces = true;
+        RestrictRealtime = true;
+        RestrictSUIDSGID = true;
+        SystemCallArchitectures = "native";
+        SystemCallFilter = [
+          "@system-service"
+          "~@privileged"
+        ];
+        UMask = "0077";
+      };
+    };
+
+    systemd.timers.rspamd-dmarc-reporter = lib.optionalAttrs (cfg.dmarcReporting.enable) {
+      description = "Daily delivery of aggregated DMARC reports";
+      wantedBy = [
+        "timers.target"
+      ];
+      timerConfig = {
+        OnCalendar = "daily";
+        Persistent = true;
+        RandomizedDelaySec = 86400;
+        FixedRandomDelay = true;
+      };
     };
 
     systemd.services.postfix = {

mail-server/systemd.nix

@@ -18,40 +18,32 @@
 
 let
   cfg = config.mailserver;
-  preliminarySelfsigned = config.security.acme.preliminarySelfsigned;
+  certificatesDeps =
-  acmeWantsTarget = [ "acme-certificates.target" ]
+    if cfg.certificateScheme == "manual" then
-    ++ (lib.optional preliminarySelfsigned "acme-selfsigned-certificates.target");
+      []
-  acmeAfterTarget = if preliminarySelfsigned
+    else if cfg.certificateScheme == "selfsigned" then
-    then [ "acme-selfsigned-certificates.target" ]
+      [ "mailserver-selfsigned-certificate.service" ]
-    else [ "acme-certificates.target" ];
+    else
+      [ "acme-finished-${cfg.fqdn}.target" ];
 in
 {
   config = with cfg; lib.mkIf enable {
-    # Add target for when certificates are available
-    systemd.targets."mailserver-certificates" = {
-      wants = lib.mkIf (cfg.certificateScheme == 3) acmeWantsTarget;
-      after = lib.mkIf (cfg.certificateScheme == 3) acmeAfterTarget;
-    };
-
     # Create self signed certificate
-    systemd.services.mailserver-selfsigned-certificate = lib.mkIf (cfg.certificateScheme == 2) {
+    systemd.services.mailserver-selfsigned-certificate = lib.mkIf (cfg.certificateScheme == "selfsigned") {
-      wantedBy = [ "mailserver-certificates.target" ];
+      after = [ "local-fs.target" ];
-      after    = [ "local-fs.target" ];
-      before   = [ "mailserver-certificates.target" ];
       script = ''
         # Create certificates if they do not exist yet
         dir="${cfg.certificateDirectory}"
         fqdn="${cfg.fqdn}"
-        case $fqdn in /*) fqdn=$(cat "$fqdn");; esac
+        [[ $fqdn == /* ]] && fqdn=$(< "$fqdn")
-        key="''${dir}/key-${cfg.fqdn}.pem";
+        key="$dir/key-${cfg.fqdn}.pem";
-        cert="''${dir}/cert-${cfg.fqdn}.pem";
+        cert="$dir/cert-${cfg.fqdn}.pem";
 
-        if [ ! -f "''${key}" ] || [ ! -f "''${cert}" ]
+        if [[ ! -f $key || ! -f $cert ]]; then
-        then
             mkdir -p "${cfg.certificateDirectory}"
-            (umask 077; "${pkgs.openssl}/bin/openssl" genrsa -out "''${key}" 2048) &&
+            (umask 077; "${pkgs.openssl}/bin/openssl" genrsa -out "$key" 2048) &&
-                "${pkgs.openssl}/bin/openssl" req -new -key "''${key}" -x509 -subj "/CN=''${fqdn}" \
+                "${pkgs.openssl}/bin/openssl" req -new -key "$key" -x509 -subj "/CN=$fqdn" \
-                        -days 3650 -out "''${cert}"
+                        -days 3650 -out "$cert"
         fi
       '';
       serviceConfig = {
@@ -62,24 +54,32 @@ in
 
     # Create maildir folder before dovecot startup
     systemd.services.dovecot2 = {
-      after = [ "mailserver-certificates.target" ];
+      wants = certificatesDeps;
-      wants = [ "mailserver-certificates.target" ];
+      after = certificatesDeps;
-      preStart = ''
+      preStart = let
+        directories = lib.strings.escapeShellArgs (
+          [ mailDirectory ]
+          ++ lib.optional (cfg.indexDir != null) cfg.indexDir
+        );
+      in ''
         # Create mail directory and set permissions. See
         # <http://wiki2.dovecot.org/SharedMailboxes/Permissions>.
-        mkdir -p "${mailDirectory}"
+        # Prevent world-readable paths, even temporarily.
-        chgrp "${vmailGroupName}" "${mailDirectory}"
+        umask 007
-        chmod 02770 "${mailDirectory}"
+        mkdir -p ${directories}
+        chgrp "${vmailGroupName}" ${directories}
+        chmod 02770 ${directories}
       '';
     };
 
     # Postfix requires dovecot lmtp socket, dovecot auth socket and certificate to work
     systemd.services.postfix = {
-      after = [ "dovecot2.service" "mailserver-certificates.target" ]
+      wants = certificatesDeps;
-        ++ (lib.optional cfg.dkimSigning "opendkim.service");
+      after = [ "dovecot2.service" ]
-      wants = [ "mailserver-certificates.target" ];
+        ++ lib.optional cfg.dkimSigning "opendkim.service"
+        ++ certificatesDeps;
       requires = [ "dovecot2.service" ]
-        ++ (lib.optional cfg.dkimSigning "opendkim.service");
+        ++ lib.optional cfg.dkimSigning "opendkim.service";
     };
   };
 }

mail-server/users.nix

@@ -21,7 +21,7 @@ with config.mailserver;
 let
   vmail_user = {
     name = vmailUserName;
-    isNormalUser = false;
+    isSystemUser = true;
     uid = vmailUID;
     home = mailDirectory;
     createHome = true;
@@ -34,32 +34,35 @@ let
 
     set -euo pipefail
 
+    # Prevent world-readable paths, even temporarily.
+    umask 007
+
     # Create directory to store user sieve scripts if it doesn't exist
-    if (! test -d "/var/sieve"); then
+    if (! test -d "${sieveDirectory}"); then
-      mkdir "/var/sieve"
+      mkdir "${sieveDirectory}"
-      chown "${vmailUserName}:${vmailGroupName}" "/var/sieve"
+      chown "${vmailUserName}:${vmailGroupName}" "${sieveDirectory}"
-      chmod 770 "/var/sieve"
+      chmod 770 "${sieveDirectory}"
     fi
 
     # Copy user's sieve script to the correct location (if it exists).  If it
     # is null, remove the file.
     ${lib.concatMapStringsSep "\n" ({ name, sieveScript }:
       if lib.isString sieveScript then ''
-        if (! test -d "/var/sieve/${name}"); then
+        if (! test -d "${sieveDirectory}/${name}"); then
-          mkdir -p "/var/sieve/${name}"
+          mkdir -p "${sieveDirectory}/${name}"
-          chown "${vmailUserName}:${vmailGroupName}" "/var/sieve/${name}"
+          chown "${vmailUserName}:${vmailGroupName}" "${sieveDirectory}/${name}"
-          chmod 770 "/var/sieve/${name}"
+          chmod 770 "${sieveDirectory}/${name}"
         fi
-        cat << 'EOF' > "/var/sieve/${name}/default.sieve"
+        cat << 'EOF' > "${sieveDirectory}/${name}/default.sieve"
         ${sieveScript}
         EOF
-        chown "${vmailUserName}:${vmailGroupName}" "/var/sieve/${name}/default.sieve"
+        chown "${vmailUserName}:${vmailGroupName}" "${sieveDirectory}/${name}/default.sieve"
       '' else ''
-        if (test -f "/var/sieve/${name}/default.sieve"); then
+        if (test -f "${sieveDirectory}/${name}/default.sieve"); then
-          rm "/var/sieve/${name}/default.sieve"
+          rm "${sieveDirectory}/${name}/default.sieve"
         fi
-        if (test -f "/var/sieve/${name}.svbin"); then
+        if (test -f "${sieveDirectory}/${name}.svbin"); then
-          rm "/var/sieve/${name}/default.svbin"
+          rm "${sieveDirectory}/${name}/default.svbin"
         fi
       '') (map (user: { inherit (user) name sieveScript; })
             (lib.attrValues loginAccounts))}

nix/sources.json

@@ -1,38 +0,0 @@
-{
-    "nixpkgs-19.09": {
-        "branch": "nixos-19.09",
-        "description": "A read-only mirror of NixOS/nixpkgs tracking the released channels. Send issues and PRs to",
-        "homepage": "https://github.com/NixOS/nixpkgs",
-        "owner": "NixOS",
-        "repo": "nixpkgs-channels",
-        "rev": "60c4ddb97fd5a730b93d759754c495e1fe8a3544",
-        "sha256": "1a1pvfz130c4cma5a21wjl7yrivc7ls1ksqqmac23srk64ipzakf",
-        "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs-channels/archive/60c4ddb97fd5a730b93d759754c495e1fe8a3544.tar.gz",
-        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
-    },
-    "nixpkgs-20.03": {
-        "branch": "nixos-20.03",
-        "description": "A read-only mirror of NixOS/nixpkgs tracking the released channels. Send issues and PRs to",
-        "homepage": "https://github.com/NixOS/nixpkgs",
-        "owner": "NixOS",
-        "repo": "nixpkgs-channels",
-        "rev": "29eddfc36d720dcc4822581175217543b387b1e8",
-        "sha256": "1gqv2m7plkladd3va664xyqb962pqs4pizzibvkm1nh0f4rfpxvy",
-        "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs-channels/archive/29eddfc36d720dcc4822581175217543b387b1e8.tar.gz",
-        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
-    },
-    "nixpkgs-unstable": {
-        "branch": "nixos-unstable",
-        "description": "A read-only mirror of NixOS/nixpkgs tracking the released channels. Send issues and PRs to",
-        "homepage": "https://github.com/NixOS/nixpkgs",
-        "owner": "NixOS",
-        "repo": "nixpkgs-channels",
-        "rev": "fce7562cf46727fdaf801b232116bc9ce0512049",
-        "sha256": "14rvi69ji61x3z88vbn17rg5vxrnw2wbnanxb7y0qzyqrj7spapx",
-        "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs-channels/archive/fce7562cf46727fdaf801b232116bc9ce0512049.tar.gz",
-        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
-    }
-}

nix/sources.nix

@@ -1,134 +0,0 @@
-# This file has been generated by Niv.
-
-let
-
-  #
-  # The fetchers. fetch_<type> fetches specs of type <type>.
-  #
-
-  fetch_file = pkgs: spec:
-    if spec.builtin or true then
-      builtins_fetchurl { inherit (spec) url sha256; }
-    else
-      pkgs.fetchurl { inherit (spec) url sha256; };
-
-  fetch_tarball = pkgs: spec:
-    if spec.builtin or true then
-      builtins_fetchTarball { inherit (spec) url sha256; }
-    else
-      pkgs.fetchzip { inherit (spec) url sha256; };
-
-  fetch_git = spec:
-    builtins.fetchGit { url = spec.repo; inherit (spec) rev ref; };
-
-  fetch_builtin-tarball = spec:
-    builtins.trace
-      ''
-        WARNING:
-          The niv type "builtin-tarball" will soon be deprecated. You should
-          instead use `builtin = true`.
-
-          $ niv modify <package> -a type=tarball -a builtin=true
-      ''
-      builtins_fetchTarball { inherit (spec) url sha256; };
-
-  fetch_builtin-url = spec:
-    builtins.trace
-      ''
-        WARNING:
-          The niv type "builtin-url" will soon be deprecated. You should
-          instead use `builtin = true`.
-
-          $ niv modify <package> -a type=file -a builtin=true
-      ''
-      (builtins_fetchurl { inherit (spec) url sha256; });
-
-  #
-  # Various helpers
-  #
-
-  # The set of packages used when specs are fetched using non-builtins.
-  mkPkgs = sources:
-    let
-      sourcesNixpkgs =
-        import (builtins_fetchTarball { inherit (sources.nixpkgs) url sha256; }) {};
-      hasNixpkgsPath = builtins.any (x: x.prefix == "nixpkgs") builtins.nixPath;
-      hasThisAsNixpkgsPath = <nixpkgs> == ./.;
-    in
-      if builtins.hasAttr "nixpkgs" sources
-      then sourcesNixpkgs
-      else if hasNixpkgsPath && ! hasThisAsNixpkgsPath then
-        import <nixpkgs> {}
-      else
-        abort
-          ''
-            Please specify either <nixpkgs> (through -I or NIX_PATH=nixpkgs=...) or
-            add a package called "nixpkgs" to your sources.json.
-          '';
-
-  # The actual fetching function.
-  fetch = pkgs: name: spec:
-
-    if ! builtins.hasAttr "type" spec then
-      abort "ERROR: niv spec ${name} does not have a 'type' attribute"
-    else if spec.type == "file" then fetch_file pkgs spec
-    else if spec.type == "tarball" then fetch_tarball pkgs spec
-    else if spec.type == "git" then fetch_git spec
-    else if spec.type == "builtin-tarball" then fetch_builtin-tarball spec
-    else if spec.type == "builtin-url" then fetch_builtin-url spec
-    else
-      abort "ERROR: niv spec ${name} has unknown type ${builtins.toJSON spec.type}";
-
-  # Ports of functions for older nix versions
-
-  # a Nix version of mapAttrs if the built-in doesn't exist
-  mapAttrs = builtins.mapAttrs or (
-    f: set: with builtins;
-    listToAttrs (map (attr: { name = attr; value = f attr set.${attr}; }) (attrNames set))
-  );
-
-  # fetchTarball version that is compatible between all the versions of Nix
-  builtins_fetchTarball = { url, sha256 }@attrs:
-    let
-      inherit (builtins) lessThan nixVersion fetchTarball;
-    in
-      if lessThan nixVersion "1.12" then
-        fetchTarball { inherit url; }
-      else
-        fetchTarball attrs;
-
-  # fetchurl version that is compatible between all the versions of Nix
-  builtins_fetchurl = { url, sha256 }@attrs:
-    let
-      inherit (builtins) lessThan nixVersion fetchurl;
-    in
-      if lessThan nixVersion "1.12" then
-        fetchurl { inherit url; }
-      else
-        fetchurl attrs;
-
-  # Create the final "sources" from the config
-  mkSources = config:
-    mapAttrs (
-      name: spec:
-        if builtins.hasAttr "outPath" spec
-        then abort
-          "The values in sources.json should not have an 'outPath' attribute"
-        else
-          spec // { outPath = fetch config.pkgs name spec; }
-    ) config.sources;
-
-  # The "config" used by the fetchers
-  mkConfig =
-    { sourcesFile ? ./sources.json
-    , sources ? builtins.fromJSON (builtins.readFile sourcesFile)
-    , pkgs ? mkPkgs sources
-    }: rec {
-      # The sources, i.e. the attribute set of spec name to spec
-      inherit sources;
-
-      # The "pkgs" (evaluated nixpkgs) to use for e.g. non-builtin fetchers
-      inherit pkgs;
-    };
-in
-mkSources (mkConfig {}) // { __functor = _: settings: mkSources (mkConfig settings); }

nixops/single-server.nix

@@ -5,7 +5,7 @@
     { config, pkgs, ... }:
     {
         imports = [
-            ./../default.nix
+            ../default.nix
         ];
 
         mailserver = {

scripts/generate-options.py

@@ -0,0 +1,82 @@
+import json
+import sys
+
+header = """
+# Mailserver options
+
+## `mailserver`
+
+"""
+
+template = """
+`````{{option}} {key}
+{description}
+
+{type}
+{default}
+{example}
+`````
+"""
+
+f = open(sys.argv[1])
+options = json.load(f)
+
+groups = ["mailserver.loginAccounts",
+          "mailserver.certificate",
+          "mailserver.dkim",
+          "mailserver.dmarcReporting",
+          "mailserver.fullTextSearch",
+          "mailserver.redis",
+          "mailserver.ldap",
+          "mailserver.monitoring",
+          "mailserver.backup",
+          "mailserver.borgbackup"]
+
+def render_option_value(opt, attr):
+  if attr in opt:
+      if isinstance(opt[attr], dict) and '_type' in opt[attr]:
+          if opt[attr]['_type'] == 'literalExpression':
+              if '\n' in opt[attr]['text']:
+                  res = '\n```nix\n' + opt[attr]['text'].rstrip('\n') + '\n```'
+              else:
+                  res = '```{}```'.format(opt[attr]['text'])
+          elif opt[attr]['_type'] == 'literalMD':
+              res = opt[attr]['text']
+      else:
+          s = str(opt[attr])
+          if s == "":
+              res = '`""`'
+          elif '\n' in s:
+              res = '\n```\n' + s.rstrip('\n') + '\n```'
+          else:
+              res = '```{}```'.format(s)
+      res = '- ' + attr + ': ' + res
+  else:
+      res = ""
+  return res
+
+def print_option(opt):
+    if isinstance(opt['description'], dict) and '_type' in opt['description']: # mdDoc
+        description = opt['description']['text']
+    else:
+        description = opt['description']
+    print(template.format(
+        key=opt['name'],
+        description=description or "",
+        type="- type: ```{}```".format(opt['type']),
+        default=render_option_value(opt, 'default'),
+        example=render_option_value(opt, 'example')))
+
+
+print(header)
+for opt in options:
+    if any([opt['name'].startswith(c) for c in groups]):
+        continue
+    print_option(opt)
+
+for c in groups:
+    print('## `{}`'.format(c))
+    print()
+    for opt in options:
+        if opt['name'].startswith(c):
+            print_option(opt)

scripts/mail-check.py

@@ -0,0 +1,197 @@
+import smtplib, sys
+import argparse
+import os
+import uuid
+import imaplib
+from datetime import datetime, timedelta
+import email
+import time
+
+RETRY = 100
+
+def _send_mail(smtp_host, smtp_port, smtp_username, from_addr, from_pwd, to_addr, subject, starttls):
+    print("Sending mail with subject '{}'".format(subject))
+    message = "\n".join([
+        "From: {from_addr}",
+        "To: {to_addr}",
+        "Subject: {subject}",
+        "",
+        "This validates our mail server can send to Gmail :/"]).format(
+            from_addr=from_addr,
+            to_addr=to_addr,
+            subject=subject)
+
+
+    retry = RETRY
+    while True:
+        try:
+            with smtplib.SMTP(smtp_host, port=smtp_port) as smtp:
+                try:
+                    if starttls:
+                        smtp.starttls()
+                    if from_pwd is not None:
+                        smtp.login(smtp_username or from_addr, from_pwd)
+
+                    smtp.sendmail(from_addr, [to_addr], message)
+                    return
+                except smtplib.SMTPResponseException as e:
+                    if e.smtp_code == 451:  # service unavailable error
+                        print(e)
+                    elif e.smtp_code == 454:  # smtplib.SMTPResponseException: (454, b'4.3.0 Try again later')
+                        print(e)
+                    else:
+                        raise
+        except OSError as e:
+            if e.errno in [16, -2]:
+                print("OSError exception message: ", e)
+            else:
+                raise
+
+        if retry > 0:
+            retry = retry - 1
+            time.sleep(1)
+            print("Retrying")
+        else:
+            print("Retry attempts exhausted")
+            exit(5)
+
+def _read_mail(
+        imap_host,
+        imap_port,
+        imap_username,
+        to_pwd,
+        subject,
+        ignore_dkim_spf,
+        show_body=False,
+        delete=True):
+    print("Reading mail from %s" % imap_username)
+
+    message = None
+
+    obj = imaplib.IMAP4_SSL(imap_host, imap_port)
+    obj.login(imap_username, to_pwd)
+    obj.select()
+
+    today = datetime.today()
+    cutoff = today - timedelta(days=1)
+    dt = cutoff.strftime('%d-%b-%Y')
+    for _ in range(0, RETRY):
+        print("Retrying")
+        obj.select()
+        typ, data = obj.search(None, '(SINCE %s) (SUBJECT "%s")'%(dt, subject))
+        if data == [b'']:
+            time.sleep(1)
+            continue
+
+        uids = data[0].decode("utf-8").split(" ")
+        if len(uids) != 1:
+          print("Warning: %d messages have been found with subject containing %s " % (len(uids), subject))
+
+        # FIXME: we only consider the first matching message...
+        uid = uids[0]
+        _, raw = obj.fetch(uid, '(RFC822)')
+        if delete:
+            obj.store(uid, '+FLAGS', '\\Deleted')
+            obj.expunge()
+        message = email.message_from_bytes(raw[0][1])
+        print("Message with subject '%s' has been found" % message['subject'])
+        if show_body:
+            for m in message.get_payload():
+                if m.get_content_type() == 'text/plain':
+                    print("Body:\n%s" % m.get_payload(decode=True).decode('utf-8'))
+        break
+
+    if message is None:
+        print("Error: no message with subject '%s' has been found in INBOX of %s" % (subject, imap_username))
+        exit(1)
+
+    if ignore_dkim_spf:
+        return
+
+    # gmail set this standardized header
+    if 'ARC-Authentication-Results' in message:
+        if "dkim=pass" in message['ARC-Authentication-Results']:
+            print("DKIM ok")
+        else:
+            print("Error: no DKIM validation found in message:")
+            print(message.as_string())
+            exit(2)
+        if "spf=pass" in message['ARC-Authentication-Results']:
+            print("SPF ok")
+        else:
+            print("Error: no SPF validation found in message:")
+            print(message.as_string())
+            exit(3)
+    else:
+        print("DKIM and SPF verification failed")
+        exit(4)
+
+def send_and_read(args):
+    src_pwd = None
+    if args.src_password_file is not None:
+        src_pwd = args.src_password_file.readline().rstrip()
+    dst_pwd = args.dst_password_file.readline().rstrip()
+
+    if args.imap_username != '':
+        imap_username = args.imap_username
+    else:
+        imap_username = args.to_addr
+
+    subject = "{}".format(uuid.uuid4())
+
+    _send_mail(smtp_host=args.smtp_host,
+               smtp_port=args.smtp_port,
+               smtp_username=args.smtp_username,
+               from_addr=args.from_addr,
+               from_pwd=src_pwd,
+               to_addr=args.to_addr,
+               subject=subject,
+               starttls=args.smtp_starttls)
+
+    _read_mail(imap_host=args.imap_host,
+               imap_port=args.imap_port,
+               imap_username=imap_username,
+               to_pwd=dst_pwd,
+               subject=subject,
+               ignore_dkim_spf=args.ignore_dkim_spf)
+
+def read(args):
+    _read_mail(imap_host=args.imap_host,
+               imap_port=args.imap_port,
+               to_addr=args.imap_username,
+               to_pwd=args.imap_password,
+               subject=args.subject,
+               ignore_dkim_spf=args.ignore_dkim_spf,
+               show_body=args.show_body,
+               delete=False)
+
+parser = argparse.ArgumentParser()
+subparsers = parser.add_subparsers()
+
+parser_send_and_read = subparsers.add_parser('send-and-read', description="Send a email with a subject containing a random UUID and then try to read this email from the recipient INBOX.")
+parser_send_and_read.add_argument('--smtp-host', type=str)
+parser_send_and_read.add_argument('--smtp-port', type=str, default=25)
+parser_send_and_read.add_argument('--smtp-starttls', action='store_true')
+parser_send_and_read.add_argument('--smtp-username', type=str, default='', help="username used for smtp login. If not specified, the from-addr value is used")
+parser_send_and_read.add_argument('--from-addr', type=str)
+parser_send_and_read.add_argument('--imap-host', required=True, type=str)
+parser_send_and_read.add_argument('--imap-port', type=str, default=993)
+parser_send_and_read.add_argument('--to-addr', type=str, required=True)
+parser_send_and_read.add_argument('--imap-username', type=str, default='', help="username used for imap login. If not specified, the to-addr value is used")
+parser_send_and_read.add_argument('--src-password-file', type=argparse.FileType('r'))
+parser_send_and_read.add_argument('--dst-password-file', required=True, type=argparse.FileType('r'))
+parser_send_and_read.add_argument('--ignore-dkim-spf', action='store_true', help="to ignore the dkim and spf verification on the read mail")
+parser_send_and_read.set_defaults(func=send_and_read)
+
+parser_read = subparsers.add_parser('read', description="Search for an email with a subject containing 'subject' in the INBOX.")
+parser_read.add_argument('--imap-host', type=str, default="localhost")
+parser_read.add_argument('--imap-port', type=str, default=993)
+parser_read.add_argument('--imap-username', required=True, type=str)
+parser_read.add_argument('--imap-password', required=True, type=str)
+parser_read.add_argument('--ignore-dkim-spf', action='store_true', help="to ignore the dkim and spf verification on the read mail")
+parser_read.add_argument('--show-body', action='store_true', help="print mail text/plain payload")
+parser_read.add_argument('subject', type=str)
+parser_read.set_defaults(func=read)
+
+args = parser.parse_args()
+args.func(args)

shell.nix

@@ -1,9 +1,10 @@
-{ nixpkgs ? <nixpkgs>, system ? builtins.currentSystem }:
+(import
-
+  (
-with (import nixpkgs { inherit system; }); stdenv.mkDerivation rec {
+    let lock = builtins.fromJSON (builtins.readFile ./flake.lock); in
-  name = "nixos-mailserver-env";
+    fetchTarball {
-  env = buildEnv { name = name; paths = buildInputs; };
+      url = "https://github.com/edolstra/flake-compat/archive/${lock.nodes.flake-compat.locked.rev}.tar.gz";
-  buildInputs = with pkgs; [
+      sha256 = lock.nodes.flake-compat.locked.narHash;
-    jq clamav
+    }
-  ];
+  )
-}
+  { src = ./.; }
+).shellNix

tests/clamav.nix

@@ -14,23 +14,12 @@
 #  You should have received a copy of the GNU General Public License
 #  along with this program. If not, see <http://www.gnu.org/licenses/>
 
-{ pkgs ? import <nixpkgs> {}}:
+{ pkgs ? import <nixpkgs> {}, blobs}:
-
-import (pkgs.path + "/nixos/tests/make-test.nix") {
 
+pkgs.nixosTest {
+  name = "clamav";
   nodes = {
     server = { config, pkgs, lib, ... }:
-      let
-        clamav-db-files = pkgs.stdenv.mkDerivation rec {
-          name = "clamav-db-files";
-          src = lib.cleanSource ./clamav;
-          dontUnpack = true;
-          installPhase = ''
-            mkdir $out
-            cp -R $src/*.cvd $out/
-          '';
-        };
-      in
         {
             imports = [
                 ../default.nix
@@ -58,9 +47,9 @@ import (pkgs.path + "/nixos/tests/make-test.nix") {
               '';
 
               script = ''
-                cp ${clamav-db-files}/main.cvd      /var/lib/clamav/
+                cp ${blobs}/clamav/main.cvd      /var/lib/clamav/
-                cp ${clamav-db-files}/daily.cvd     /var/lib/clamav/
+                cp ${blobs}/clamav/daily.cvd     /var/lib/clamav/
-                cp ${clamav-db-files}/bytecode.cvd  /var/lib/clamav/
+                cp ${blobs}/clamav/bytecode.cvd  /var/lib/clamav/
                 chown clamav:clamav /var/lib/clamav/*
               '';
 
@@ -73,7 +62,6 @@ import (pkgs.path + "/nixos/tests/make-test.nix") {
 
             mailserver = {
               enable = true;
-              debug = true;
               fqdn = "mail.example.com";
               domains = [ "example.com" "example2.com" ];
               virusScanning = true;
@@ -194,52 +182,56 @@ import (pkgs.path + "/nixos/tests/make-test.nix") {
 
   testScript = { nodes, ... }:
       ''
-      startAll;
+      start_all()
 
-      $server->waitForUnit("multi-user.target");
+      server.wait_for_unit("multi-user.target")
-      $client->waitForUnit("multi-user.target");
+      client.wait_for_unit("multi-user.target")
 
       # TODO put this blocking into the systemd units? I am not sure if rspamd already waits for the clamd socket.
-      $server->waitUntilSucceeds("timeout 1 ${nodes.server.pkgs.netcat}/bin/nc -U /run/rspamd/rspamd-milter.sock < /dev/null; [ \$? -eq 124 ]");
+      server.wait_until_succeeds(
-      $server->waitUntilSucceeds("timeout 1 ${nodes.server.pkgs.netcat}/bin/nc -U /run/clamav/clamd.ctl < /dev/null; [ \$? -eq 124 ]");
+          "set +e; timeout 1 ${nodes.server.nixpkgs.pkgs.netcat}/bin/nc -U /run/rspamd/rspamd-milter.sock < /dev/null; [ $? -eq 124 ]"
+      )
+      server.wait_until_succeeds(
+          "set +e; timeout 1 ${nodes.server.nixpkgs.pkgs.netcat}/bin/nc -U /run/clamav/clamd.ctl < /dev/null; [ $? -eq 124 ]"
+      )
 
-      $client->execute("cp -p /etc/root/.* ~/");
+      client.execute("cp -p /etc/root/.* ~/")
-      $client->succeed("mkdir -p ~/mail");
+      client.succeed("mkdir -p ~/mail")
-      $client->succeed("ls -la ~/ >&2");
+      client.succeed("ls -la ~/ >&2")
-      $client->succeed("cat ~/.fetchmailrc >&2");
+      client.succeed("cat ~/.fetchmailrc >&2")
-      $client->succeed("cat ~/.procmailrc >&2");
+      client.succeed("cat ~/.procmailrc >&2")
-      $client->succeed("cat ~/.msmtprc >&2");
+      client.succeed("cat ~/.msmtprc >&2")
 
       # fetchmail returns EXIT_CODE 1 when no new mail
-      $client->succeed("fetchmail --nosslcertck -v || [ \$? -eq 1 ] >&2");
+      client.succeed("fetchmail --nosslcertck -v || [ $? -eq 1 ] >&2")
 
       # Verify that mail can be sent and received before testing virus scanner
-      $client->execute("rm ~/mail/*");
+      client.execute("rm ~/mail/*")
-      $client->succeed("msmtp -a user2 user1\@example.com < /etc/root/safe-email >&2");
+      client.succeed("msmtp -a user2 user1@example.com < /etc/root/safe-email >&2")
       # give the mail server some time to process the mail
-      $server->waitUntilFails('[ "$(postqueue -p)" != "Mail queue is empty" ]');
+      server.wait_until_fails('[ "$(postqueue -p)" != "Mail queue is empty" ]')
-      $client->execute("rm ~/mail/*");
+      client.execute("rm ~/mail/*")
       # fetchmail returns EXIT_CODE 0 when it retrieves mail
-      $client->succeed("fetchmail --nosslcertck -v >&2");
+      client.succeed("fetchmail --nosslcertck -v >&2")
-      $client->execute("rm ~/mail/*");
+      client.execute("rm ~/mail/*")
 
-      subtest "virus scan file", sub {
+      with subtest("virus scan file"):
-          $server->succeed("clamdscan \$(readlink -f /etc/root/eicar.com.txt) | grep \"Txt\\.Malware\\.Agent-1787597 FOUND\" >&2");
+          server.succeed(
-      };
+              'set +o pipefail; clamdscan $(readlink -f /etc/root/eicar.com.txt) | grep "Txt\\.Malware\\.Agent-1787597 FOUND" >&2'
+          )
 
-      subtest "virus scan email", sub {
+      with subtest("virus scan email"):
-          $client->succeed("msmtp -a user2 user1\@example.com < /etc/root/virus-email 2>&1 | tee /dev/stderr | grep \"server message: 554 5\\.7\\.1\" >&2");
+          client.succeed(
-          $server->succeed("journalctl -u rspamd | grep -i eicar");
+              'set +o pipefail; msmtp -a user2 user1\@example.com < /etc/root/virus-email 2>&1 | tee /dev/stderr | grep "server message: 554 5\\.7\\.1" >&2'
+          )
+          server.succeed("journalctl -u rspamd | grep -i eicar")
           # give the mail server some time to process the mail
-          $server->waitUntilFails('[ "$(postqueue -p)" != "Mail queue is empty" ]');
+          server.wait_until_fails('[ "$(postqueue -p)" != "Mail queue is empty" ]')
-      };
-
-      subtest "no warnings or errors", sub {
-          $server->fail("journalctl -u postfix | grep -i error >&2");
-          $server->fail("journalctl -u postfix | grep -i warning >&2");
-          $server->fail("journalctl -u dovecot2 | grep -i error >&2");
-          $server->fail("journalctl -u dovecot2 | grep -i warning >&2");
-      };
 
+      with subtest("no warnings or errors"):
+          server.fail("journalctl -u postfix | grep -i error >&2")
+          server.fail("journalctl -u postfix | grep -i warning >&2")
+          server.fail("journalctl -u dovecot2 | grep -i error >&2")
+          server.fail("journalctl -u dovecot2 | grep -i warning >&2")
     '';
 }

tests/clamav/.gitattributes

@@ -1 +0,0 @@
-*cvd filter=lfs diff=lfs merge=lfs -text

tests/clamav/.gitignore

@@ -1 +0,0 @@
-mirrors.dat

tests/clamav/freshclam.conf

@@ -1 +0,0 @@
-DatabaseMirror database.clamav.net

tests/clamav/hashes.json

@@ -1,5 +0,0 @@
-{
-  "bytecode.cvd": "633d4f0a2054249e23df12db5a9e76bcaac23cadaef5ee8f644986f600d8d81e",
-  "daily.cvd": "0b6798b54e490be168b873d39ebda41ff4a027720aed855f879779b88982838f",
-  "main.cvd": "9694933f37148ec39c1f2ef7b97211ded9b03b140bb48a5eeb27270120844b24"
-}

tests/clamav/update-clamav-database.sh

@@ -1,15 +0,0 @@
-#!/bin/sh
-
-set -e
-
-cd "$(dirname "${0}")"
-
-rm ./*.cvd hashes.json || :
-
-freshclam --datadir=. --config-file=freshclam.conf
-(for i in ./*.cvd;
- do echo '{}' |
-     jq --arg path "$(basename "${i}")" \
-        --arg sha256sum "$(sha256sum "${i}" | awk '{ print $1; }')" \
-        '.[$path] = $sha256sum'; done) |
-  jq -s add > hashes.json

tests/default.nix

@@ -1,49 +0,0 @@
-# Generate an attribute sets containing all tests for all releaeses
-# It looks like:
-# - extern.nixpkgs_19_09
-# - extern.nixpkgs_20.03
-# - extern.nixpkgs_unstable
-# - intern.nixpkgs_19_09
-# - intern.nixpkgs_20.03
-# - intern.nixpkgs_unstable
-
-with builtins;
-
-let
-  sources = import ../nix/sources.nix;
-
-  releases = listToAttrs (map genRelease releaseNames);
-
-  genRelease = name: {
-    name = name;
-    value = import sources."${name}" {};
-  };
-
-  genTest = testName: release:
-  let
-    pkgs = releases."${release}";
-    test = pkgs.callPackage (./. + "/${testName}.nix") { };
-  in {
-    "name"= builtins.replaceStrings ["." "-"] ["_" "_"] release;
-    "value"= test { inherit pkgs; };
-  };
-
-  releaseNames = [
-    "nixpkgs-19.09"
-    "nixpkgs-20.03"
-    "nixpkgs-unstable"
-  ];
-
-  testNames = [
-    "intern"
-    "extern"
-    "clamav"
-  ];
-
-  # Generate an attribute set containing one test per releases
-  genTests = testName: {
-    name = testName;
-    value = listToAttrs (map (genTest testName) (builtins.attrNames releases));
-  };
-  
-in listToAttrs (map genTests testNames)

tests/external.nix

@@ -14,10 +14,10 @@
 #  You should have received a copy of the GNU General Public License
 #  along with this program. If not, see <http://www.gnu.org/licenses/>
 
-{ pkgs ? import <nixpkgs> {}}:
+{ pkgs ? import <nixpkgs> {}, ...}:
-
-import (pkgs.path + "/nixos/tests/make-test.nix") {
 
+pkgs.nixosTest {
+  name = "external";
   nodes = {
     server = { config, pkgs, ... }:
         {
@@ -43,6 +43,11 @@ import (pkgs.path + "/nixos/tests/make-test.nix") {
               domains = [ "example.com" "example2.com" ];
               rewriteMessageId = true;
               dkimKeyBits = 1535;
+              dmarcReporting = {
+                enable = true;
+                domain = "example.com";
+                organizationName = "ACME Corp";
+              };
 
               loginAccounts = {
                   "user1@example.com" = {
@@ -70,6 +75,15 @@ import (pkgs.path + "/nixos/tests/make-test.nix") {
 
               enableImap = true;
               enableImapSsl = true;
+              fullTextSearch = {
+                enable = true;
+                autoIndex = true;
+                # special use depends on https://github.com/NixOS/nixpkgs/pull/93201
+                autoIndexExclude = [ (if (pkgs.lib.versionAtLeast pkgs.lib.version "21") then "\\Junk" else "Junk") ];
+                enforced = "yes";
+                # fts-xapian warns when memory is low, which makes the test fail
+                memoryLimit = 100000;
+              };
             };
         };
       client = { nodes, config, pkgs, ... }: let
@@ -139,12 +153,32 @@ import (pkgs.path + "/nixos/tests/make-test.nix") {
 
             imap.close()
         '';
+        search = pkgs.writeScriptBin "search" ''
+          #!${pkgs.python3.interpreter}
+          import imaplib
+          import sys
+
+          [_, mailbox, needle] = sys.argv
+
+          with imaplib.IMAP4_SSL('${serverIP}') as imap:
+            imap.login('user1@example.com', 'user1')
+            imap.select(mailbox)
+            status, [response] = imap.search(None, 'BODY', repr(needle))
+            msg_ids = [ i for i in response.decode("utf-8").split(' ') if i ]
+            print(msg_ids)
+            assert status == 'OK'
+            assert len(msg_ids) == 1
+            status, response = imap.fetch(msg_ids[0], '(RFC822)')
+            assert status == "OK"
+            assert needle in repr(response)
+            imap.close()
+        '';
       in {
         imports = [
             ./lib/config.nix
         ];
         environment.systemPackages = with pkgs; [
-          fetchmail msmtp procmail findutils grep-ip check-mail-id test-imap-spam test-imap-ham
+          fetchmail msmtp procmail findutils grep-ip check-mail-id test-imap-spam test-imap-ham search
         ];
         environment.etc = {
           "root/.fetchmailrc" = {
@@ -276,143 +310,205 @@ import (pkgs.path + "/nixos/tests/make-test.nix") {
 
             XOXO User1
           '';
+          "root/email6".text = ''
+            Message-ID: <123457qwerty@host.local.network>
+            From: User2 <user2@example.com>
+            To: User1 <user1@example.com>
+            Cc:
+            Bcc:
+            Subject: This is a test Email from user2 to user1
+            Reply-To:
+
+            Hello User1,
+
+            this email contains the needle:
+            576a4565b70f5a4c1a0925cabdb587a6 
+          '';
+          "root/email7".text = ''
+            Message-ID: <1234578qwerty@host.local.network>
+            From: User2 <user2@example.com>
+            To: User1 <user1@example.com>
+            Cc:
+            Bcc:
+            Subject: This is a test Email from user2 to user1
+            Reply-To:
+
+            Hello User1,
+
+            this email does not contain the needle :(
+          '';
         };
       };
     };
 
   testScript = { nodes, ... }:
       ''
-      startAll;
+      start_all()
 
-      $server->waitForUnit("multi-user.target");
+      server.wait_for_unit("multi-user.target")
-      $client->waitForUnit("multi-user.target");
+      client.wait_for_unit("multi-user.target")
 
       # TODO put this blocking into the systemd units?
-      $server->waitUntilSucceeds("timeout 1 ${nodes.server.pkgs.netcat}/bin/nc -U /run/rspamd/rspamd-milter.sock < /dev/null; [ \$? -eq 124 ]");
+      server.wait_until_succeeds(
+          "set +e; timeout 1 ${nodes.server.nixpkgs.pkgs.netcat}/bin/nc -U /run/rspamd/rspamd-milter.sock < /dev/null; [ $? -eq 124 ]"
+      )
 
-      $client->execute("cp -p /etc/root/.* ~/");
+      client.execute("cp -p /etc/root/.* ~/")
-      $client->succeed("mkdir -p ~/mail");
+      client.succeed("mkdir -p ~/mail")
-      $client->succeed("ls -la ~/ >&2");
+      client.succeed("ls -la ~/ >&2")
-      $client->succeed("cat ~/.fetchmailrc >&2");
+      client.succeed("cat ~/.fetchmailrc >&2")
-      $client->succeed("cat ~/.procmailrc >&2");
+      client.succeed("cat ~/.procmailrc >&2")
-      $client->succeed("cat ~/.msmtprc >&2");
+      client.succeed("cat ~/.msmtprc >&2")
 
-      subtest "imap retrieving mail", sub {
+      with subtest("imap retrieving mail"):
           # fetchmail returns EXIT_CODE 1 when no new mail
-          $client->succeed("fetchmail --nosslcertck -v || [ \$? -eq 1 ] >&2");
+          client.succeed("fetchmail --nosslcertck -v || [ $? -eq 1 ] >&2")
-      };
 
-      subtest "submission port send mail", sub {
+      with subtest("submission port send mail"):
           # send email from user2 to user1
-          $client->succeed("msmtp -a test --tls=on --tls-certcheck=off --auth=on user1\@example.com < /etc/root/email1 >&2");
+          client.succeed(
+              "msmtp -a test --tls=on --tls-certcheck=off --auth=on user1\@example.com < /etc/root/email1 >&2"
+          )
           # give the mail server some time to process the mail
-          $server->waitUntilFails('[ "$(postqueue -p)" != "Mail queue is empty" ]');
+          server.wait_until_fails('[ "$(postqueue -p)" != "Mail queue is empty" ]')
-      };
 
-      subtest "imap retrieving mail 2", sub {
+      with subtest("imap retrieving mail 2"):
-          $client->execute("rm ~/mail/*");
+          client.execute("rm ~/mail/*")
           # fetchmail returns EXIT_CODE 0 when it retrieves mail
-          $client->succeed("fetchmail --nosslcertck -v >&2");
+          client.succeed("fetchmail --nosslcertck -v >&2")
-      };
 
-      subtest "remove sensitive information on submission port", sub {
+      with subtest("remove sensitive information on submission port"):
-        $client->succeed("cat ~/mail/* >&2");
+          client.succeed("cat ~/mail/* >&2")
-        ## make sure our IP is _not_ in the email header
+          ## make sure our IP is _not_ in the email header
-        $client->fail("grep-ip ~/mail/*");
+          client.fail("grep-ip ~/mail/*")
-        $client->succeed("check-mail-id ~/mail/*");
+          client.succeed("check-mail-id ~/mail/*")
-      };
 
-      subtest "have correct fqdn as sender", sub {
+      with subtest("have correct fqdn as sender"):
-        $client->succeed("grep 'Received: from mail.example.com' ~/mail/*");
+          client.succeed("grep 'Received: from mail.example.com' ~/mail/*")
-      };
 
-      subtest "dkim has user-specified size", sub {
+      with subtest("dkim has user-specified size"):
-        $server->succeed("openssl rsa -in /var/dkim/example.com.mail.key -text -noout | grep 'Private-Key: (1535 bit'");
+          server.succeed(
-      };
+              "openssl rsa -in /var/dkim/example.com.mail.key -text -noout | grep 'Private-Key: (1535 bit'"
+          )
 
-      subtest "dkim singing, multiple domains", sub {
+      with subtest("dkim singing, multiple domains"):
-          $client->execute("rm ~/mail/*");
+          client.execute("rm ~/mail/*")
           # send email from user2 to user1
-          $client->succeed("msmtp -a test2 --tls=on --tls-certcheck=off --auth=on user1\@example.com < /etc/root/email2 >&2");
+          client.succeed(
-          $server->waitUntilFails('[ "$(postqueue -p)" != "Mail queue is empty" ]');
+              "msmtp -a test2 --tls=on --tls-certcheck=off --auth=on user1\@example.com < /etc/root/email2 >&2"
+          )
+          server.wait_until_fails('[ "$(postqueue -p)" != "Mail queue is empty" ]')
           # fetchmail returns EXIT_CODE 0 when it retrieves mail
-          $client->succeed("fetchmail  --nosslcertck -v");
+          client.succeed("fetchmail  --nosslcertck -v")
-          $client->succeed("cat ~/mail/* >&2");
+          client.succeed("cat ~/mail/* >&2")
           # make sure it is dkim signed
-          $client->succeed("grep DKIM ~/mail/*");
+          client.succeed("grep DKIM ~/mail/*")
-      };
 
-      subtest "aliases", sub {
+      with subtest("aliases"):
-          $client->execute("rm ~/mail/*");
+          client.execute("rm ~/mail/*")
           # send email from chuck to postmaster
-          $client->succeed("msmtp -a test3 --tls=on --tls-certcheck=off --auth=on postmaster\@example.com < /etc/root/email2 >&2");
+          client.succeed(
-          $server->waitUntilFails('[ "$(postqueue -p)" != "Mail queue is empty" ]');
+              "msmtp -a test3 --tls=on --tls-certcheck=off --auth=on postmaster\@example.com < /etc/root/email2 >&2"
+          )
+          server.wait_until_fails('[ "$(postqueue -p)" != "Mail queue is empty" ]')
           # fetchmail returns EXIT_CODE 0 when it retrieves mail
-          $client->succeed("fetchmail --nosslcertck -v");
+          client.succeed("fetchmail --nosslcertck -v")
-      };
 
-      subtest "catchAlls", sub {
+      with subtest("catchAlls"):
-          $client->execute("rm ~/mail/*");
+          client.execute("rm ~/mail/*")
           # send email from chuck to non exsitent account
-          $client->succeed("msmtp -a test3 --tls=on --tls-certcheck=off --auth=on lol\@example.com < /etc/root/email2 >&2");
+          client.succeed(
-          $server->waitUntilFails('[ "$(postqueue -p)" != "Mail queue is empty" ]');
+              "msmtp -a test3 --tls=on --tls-certcheck=off --auth=on lol\@example.com < /etc/root/email2 >&2"
+          )
+          server.wait_until_fails('[ "$(postqueue -p)" != "Mail queue is empty" ]')
           # fetchmail returns EXIT_CODE 0 when it retrieves mail
-          $client->succeed("fetchmail --nosslcertck -v");
+          client.succeed("fetchmail --nosslcertck -v")
 
-          $client->execute("rm ~/mail/*");
+          client.execute("rm ~/mail/*")
           # send email from user1 to chuck
-          $client->succeed("msmtp -a test4 --tls=on --tls-certcheck=off --auth=on chuck\@example.com < /etc/root/email2 >&2");
+          client.succeed(
-          $server->waitUntilFails('[ "$(postqueue -p)" != "Mail queue is empty" ]');
+              "msmtp -a test4 --tls=on --tls-certcheck=off --auth=on chuck\@example.com < /etc/root/email2 >&2"
+          )
+          server.wait_until_fails('[ "$(postqueue -p)" != "Mail queue is empty" ]')
           # fetchmail returns EXIT_CODE 1 when no new mail
           # if this succeeds, it means that user1 recieved the mail that was intended for chuck.
-          $client->fail("fetchmail --nosslcertck -v");
+          client.fail("fetchmail --nosslcertck -v")
-      };
 
-      subtest "extraVirtualAliases", sub {
+      with subtest("extraVirtualAliases"):
-          $client->execute("rm ~/mail/*");
+          client.execute("rm ~/mail/*")
           # send email from single-alias to user1
-          $client->succeed("msmtp -a test5 --tls=on --tls-certcheck=off --auth=on user1\@example.com < /etc/root/email4 >&2");
+          client.succeed(
-          $server->waitUntilFails('[ "$(postqueue -p)" != "Mail queue is empty" ]');
+              "msmtp -a test5 --tls=on --tls-certcheck=off --auth=on user1\@example.com < /etc/root/email4 >&2"
+          )
+          server.wait_until_fails('[ "$(postqueue -p)" != "Mail queue is empty" ]')
           # fetchmail returns EXIT_CODE 0 when it retrieves mail
-          $client->succeed("fetchmail --nosslcertck -v");
+          client.succeed("fetchmail --nosslcertck -v")
 
-          $client->execute("rm ~/mail/*");
+          client.execute("rm ~/mail/*")
           # send email from user1 to multi-alias (user{1,2}@example.com)
-          $client->succeed("msmtp -a test --tls=on --tls-certcheck=off --auth=on multi-alias\@example.com < /etc/root/email5 >&2");
+          client.succeed(
-          $server->waitUntilFails('[ "$(postqueue -p)" != "Mail queue is empty" ]');
+              "msmtp -a test --tls=on --tls-certcheck=off --auth=on multi-alias\@example.com < /etc/root/email5 >&2"
+          )
+          server.wait_until_fails('[ "$(postqueue -p)" != "Mail queue is empty" ]')
           # fetchmail returns EXIT_CODE 0 when it retrieves mail
-          $client->succeed("fetchmail --nosslcertck -v");
+          client.succeed("fetchmail --nosslcertck -v")
-      };
 
-      subtest "quota", sub {
+      with subtest("quota"):
-          $client->execute("rm ~/mail/*");
+          client.execute("rm ~/mail/*")
-          $client->execute("mv ~/.fetchmailRcLowQuota ~/.fetchmailrc");
+          client.execute("mv ~/.fetchmailRcLowQuota ~/.fetchmailrc")
 
-          $client->succeed("msmtp -a test3 --tls=on --tls-certcheck=off --auth=on lowquota\@example.com < /etc/root/email2 >&2");
+          client.succeed(
-          $server->waitUntilFails('[ "$(postqueue -p)" != "Mail queue is empty" ]');
+              "msmtp -a test3 --tls=on --tls-certcheck=off --auth=on lowquota\@example.com < /etc/root/email2 >&2"
+          )
+          server.wait_until_fails('[ "$(postqueue -p)" != "Mail queue is empty" ]')
           # fetchmail returns EXIT_CODE 0 when it retrieves mail
-          $client->fail("fetchmail --nosslcertck -v");
+          client.fail("fetchmail --nosslcertck -v")
 
-      };
+      with subtest("imap sieve junk trainer"):
-
-      subtest "imap sieve junk trainer", sub {
           # send email from user2 to user1
-          $client->succeed("msmtp -a test --tls=on --tls-certcheck=off --auth=on user1\@example.com < /etc/root/email1 >&2");
+          client.succeed(
+              "msmtp -a test --tls=on --tls-certcheck=off --auth=on user1\@example.com < /etc/root/email1 >&2"
+          )
           # give the mail server some time to process the mail
-          $server->waitUntilFails('[ "$(postqueue -p)" != "Mail queue is empty" ]');
+          server.wait_until_fails('[ "$(postqueue -p)" != "Mail queue is empty" ]')
 
-          $client->succeed("imap-mark-spam >&2");
+          client.succeed("imap-mark-spam >&2")
-          $server->waitUntilSucceeds("journalctl -u dovecot2 | grep -i sa-learn-spam.sh >&2");
+          server.wait_until_succeeds("journalctl -u dovecot2 | grep -i sa-learn-spam.sh >&2")
-          $client->succeed("imap-mark-ham >&2");
+          client.succeed("imap-mark-ham >&2")
-          $server->waitUntilSucceeds("journalctl -u dovecot2 | grep -i sa-learn-ham.sh >&2");
+          server.wait_until_succeeds("journalctl -u dovecot2 | grep -i sa-learn-ham.sh >&2")
-      };
 
-      subtest "no warnings or errors", sub {
+      with subtest("full text search and indexation"):
-          $server->fail("journalctl -u postfix | grep -i error >&2");
+          # send 2 email from user2 to user1
-          $server->fail("journalctl -u postfix | grep -i warning >&2");
+          client.succeed(
-          $server->fail("journalctl -u dovecot2 | grep -i error >&2");
+              "msmtp -a test --tls=on --tls-certcheck=off --auth=on user1\@example.com < /etc/root/email6 >&2"
-          $server->fail("journalctl -u dovecot2 | grep -i warning >&2");
+          )
-      };
+          client.succeed(
+              "msmtp -a test --tls=on --tls-certcheck=off --auth=on user1\@example.com < /etc/root/email7 >&2"
+          )
+          # give the mail server some time to process the mail
+          server.wait_until_fails('[ "$(postqueue -p)" != "Mail queue is empty" ]')
 
+          # should find exactly one email containing this
+          client.succeed("search INBOX 576a4565b70f5a4c1a0925cabdb587a6 >&2")
+          # should fail because this folder is not indexed
+          client.fail("search Junk a >&2")
+          # check that search really goes through the indexer
+          server.succeed(
+              "journalctl -u dovecot2 | grep -E 'indexer-worker.* Done indexing .INBOX.' >&2"
+          )
+          # check that Junk is not indexed
+          server.fail("journalctl -u dovecot2 | grep 'indexer-worker' | grep -i 'JUNK' >&2")
+
+      with subtest("dmarc reporting"):
+          server.systemctl("start rspamd-dmarc-reporter.service")
+
+      with subtest("no warnings or errors"):
+          server.fail("journalctl -u postfix | grep -i error >&2")
+          server.fail("journalctl -u postfix | grep -i warning >&2")
+          server.fail("journalctl -u dovecot2 | grep -i error >&2")
+          # harmless ? https://dovecot.org/pipermail/dovecot/2020-August/119575.html
+          server.fail(
+              "journalctl -u dovecot2 |grep -v 'Expunged message reappeared, giving a new UID'| grep -v 'FTS Xapian: Box is empty' | grep -i warning >&2"
+          )
     '';
 }

tests/intern.nix

@@ -1,85 +0,0 @@
-#  nixos-mailserver: a simple mail server
-#  Copyright (C) 2016-2018  Robin Raymond
-#
-#  This program is free software: you can redistribute it and/or modify
-#  it under the terms of the GNU General Public License as published by
-#  the Free Software Foundation, either version 3 of the License, or
-#  (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program. If not, see <http://www.gnu.org/licenses/>
-
-{ pkgs ? import <nixpkgs> {}}:
-
-let
-  sendMail = pkgs.writeTextFile {
-    "name" = "send-mail-to-send-only-account";
-    "text" = ''
-      EHLO mail.example.com
-      MAIL FROM: none@example.com
-      RCPT TO: send-only@example.com
-      QUIT
-    '';
-  };
-
-  hashPassword = password: pkgs.runCommand
-    "password-${password}-hashed"
-    { buildInputs = [ pkgs.mkpasswd ]; } ''
-      mkpasswd -m sha-512 ${password} > $out
-    '';
-
-in
-import (pkgs.path + "/nixos/tests/make-test.nix") {
-
-  machine =
-    { config, pkgs, ... }:
-    {
-        imports = [
-            ./../default.nix
-            ./lib/config.nix
-        ];
-
-        virtualisation.memorySize = 1024;
-
-        mailserver = {
-          enable = true;
-          fqdn = "mail.example.com";
-          domains = [ "example.com" ];
-
-          loginAccounts = {
-              "user1@example.com" = {
-                  hashedPassword = "$6$/z4n8AQl6K$kiOkBTWlZfBd7PvF5GsJ8PmPgdZsFGN1jPGZufxxr60PoR0oUsrvzm2oQiflyz5ir9fFJ.d/zKm/NgLXNUsNX/";
-              };
-              "send-only@example.com" = {
-                  hashedPasswordFile = hashPassword "send-only";
-                  sendOnly = true;
-              };
-          };
-
-          vmailGroupName = "vmail";
-          vmailUID = 5000;
-        };
-    };
-
-  testScript =
-    ''
-      $machine->start;
-      $machine->waitForUnit("multi-user.target");
-
-      subtest "vmail gid is set correctly", sub {
-            $machine->succeed("getent group vmail | grep 5000");
-      };
-
-      subtest "mail to send only accounts is rejected", sub {
-            $machine->waitForOpenPort(25);
-            # TODO put this blocking into the systemd units?
-            $machine->waitUntilSucceeds("timeout 1 ${pkgs.netcat}/bin/nc -U /run/rspamd/rspamd-milter.sock < /dev/null; [ \$? -eq 124 ]");
-            $machine->succeed("cat ${sendMail} | ${pkgs.netcat-gnu}/bin/nc localhost 25 | grep -q 'This account cannot receive emails'" );
-      };
-    '';
-}

tests/internal.nix

@@ -0,0 +1,195 @@
+#  nixos-mailserver: a simple mail server
+#  Copyright (C) 2016-2018  Robin Raymond
+#
+#  This program is free software: you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation, either version 3 of the License, or
+#  (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program. If not, see <http://www.gnu.org/licenses/>
+
+{ pkgs ? import <nixpkgs> {}, ...}:
+
+let
+  sendMail = pkgs.writeTextFile {
+    "name" = "send-mail-to-send-only-account";
+    "text" = ''
+      EHLO mail.example.com
+      MAIL FROM: none@example.com
+      RCPT TO: send-only@example.com
+      QUIT
+    '';
+  };
+
+  hashPassword = password: pkgs.runCommand
+    "password-${password}-hashed"
+    { buildInputs = [ pkgs.mkpasswd ]; inherit password; } ''
+      mkpasswd -sm bcrypt <<<"$password" > $out
+    '';
+
+  hashedPasswordFile = hashPassword "my-password";
+  passwordFile = pkgs.writeText "password" "my-password";
+in
+pkgs.nixosTest {
+  name = "internal";
+  nodes = {
+    machine = { config, pkgs, ... }: {
+      imports = [
+        ./../default.nix
+        ./lib/config.nix
+      ];
+
+      virtualisation.memorySize = 1024;
+
+      environment.systemPackages = [
+        (pkgs.writeScriptBin "mail-check" ''
+          ${pkgs.python3}/bin/python ${../scripts/mail-check.py} $@
+        '')];
+
+      mailserver = {
+        enable = true;
+        fqdn = "mail.example.com";
+        domains = [ "example.com" "domain.com" ];
+        localDnsResolver = false;
+
+        loginAccounts = {
+          "user1@example.com" = {
+            hashedPasswordFile = hashedPasswordFile;
+          };
+          "user2@example.com" = {
+            hashedPasswordFile = hashedPasswordFile;
+            aliasesRegexp = [''/^user2.*@domain\.com$/''];
+          };
+          "send-only@example.com" = {
+            hashedPasswordFile = hashPassword "send-only";
+            sendOnly = true;
+          };
+        };
+        forwards = {
+          # user2@example.com is a local account and its mails are
+          # also forwarded to user1@example.com
+          "user2@example.com" = "user1@example.com";
+        };
+
+        vmailGroupName = "vmail";
+        vmailUID = 5000;
+
+        enableImap = false;
+      };
+    };
+  };
+  testScript = ''
+    machine.start()
+    machine.wait_for_unit("multi-user.target")
+
+    # Regression test for https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/issues/205
+    with subtest("mail forwarded can are locally kept"):
+        # A mail sent to user2@example.com is in the user1@example.com mailbox
+        machine.succeed(
+            " ".join(
+                [
+                    "mail-check send-and-read",
+                    "--smtp-port 587",
+                    "--smtp-starttls",
+                    "--smtp-host localhost",
+                    "--imap-host localhost",
+                    "--imap-username user1@example.com",
+                    "--from-addr user1@example.com",
+                    "--to-addr user2@example.com",
+                    "--src-password-file ${passwordFile}",
+                    "--dst-password-file ${passwordFile}",
+                    "--ignore-dkim-spf",
+                ]
+            )
+        )
+        # A mail sent to user2@example.com is in the user2@example.com mailbox
+        machine.succeed(
+            " ".join(
+                [
+                    "mail-check send-and-read",
+                    "--smtp-port 587",
+                    "--smtp-starttls",
+                    "--smtp-host localhost",
+                    "--imap-host localhost",
+                    "--imap-username user2@example.com",
+                    "--from-addr user1@example.com",
+                    "--to-addr user2@example.com",
+                    "--src-password-file ${passwordFile}",
+                    "--dst-password-file ${passwordFile}",
+                    "--ignore-dkim-spf",
+                ]
+            )
+        )
+
+    with subtest("regex email alias are received"):
+        # A mail sent to user2-regex-alias@domain.com is in the user2@example.com mailbox
+        machine.succeed(
+            " ".join(
+                [
+                    "mail-check send-and-read",
+                    "--smtp-port 587",
+                    "--smtp-starttls",
+                    "--smtp-host localhost",
+                    "--imap-host localhost",
+                    "--imap-username user2@example.com",
+                    "--from-addr user1@example.com",
+                    "--to-addr user2-regex-alias@domain.com",
+                    "--src-password-file ${passwordFile}",
+                    "--dst-password-file ${passwordFile}",
+                    "--ignore-dkim-spf",
+                ]
+            )
+        )
+
+    with subtest("user can send from regex email alias"):
+        # A mail sent from user2-regex-alias@domain.com, using user2@example.com credentials is received
+        machine.succeed(
+            " ".join(
+                [
+                    "mail-check send-and-read",
+                    "--smtp-port 587",
+                    "--smtp-starttls",
+                    "--smtp-host localhost",
+                    "--imap-host localhost",
+                    "--smtp-username user2@example.com",
+                    "--from-addr user2-regex-alias@domain.com",
+                    "--to-addr user1@example.com",
+                    "--src-password-file ${passwordFile}",
+                    "--dst-password-file ${passwordFile}",
+                    "--ignore-dkim-spf",
+                ]
+            )
+        )
+
+    with subtest("vmail gid is set correctly"):
+        machine.succeed("getent group vmail | grep 5000")
+
+    with subtest("mail to send only accounts is rejected"):
+        machine.wait_for_open_port(25)
+        # TODO put this blocking into the systemd units
+        machine.wait_until_succeeds(
+            "set +e; timeout 1 ${pkgs.netcat}/bin/nc -U /run/rspamd/rspamd-milter.sock < /dev/null; [ $? -eq 124 ]"
+        )
+        machine.succeed(
+            "cat ${sendMail} | ${pkgs.netcat-gnu}/bin/nc localhost 25 | grep -q '554 5.5.0 Error'"
+        )
+
+    with subtest("rspamd controller serves web ui"):
+        machine.succeed(
+            "set +o pipefail; ${pkgs.curl}/bin/curl --unix-socket /run/rspamd/worker-controller.sock http://localhost/ | grep -q '<body>'"
+        )
+
+    with subtest("imap port 143 is closed and imaps is serving SSL"):
+        machine.wait_for_closed_port(143)
+        machine.wait_for_open_port(993)
+        machine.succeed(
+            "echo | ${pkgs.openssl}/bin/openssl s_client -connect localhost:993 | grep 'New, TLS'"
+        )
+  '';
+}

tests/ldap.nix

@@ -0,0 +1,183 @@
+{ pkgs ? import <nixpkgs> {}
+, ...
+}:
+
+let
+  bindPassword = "unsafegibberish";
+  alicePassword = "testalice";
+  bobPassword = "testbob";
+in
+pkgs.nixosTest {
+  name = "ldap";
+  nodes = {
+    machine = { config, pkgs, ... }: {
+      imports = [
+        ./../default.nix
+        ./lib/config.nix
+      ];
+
+      virtualisation.memorySize = 1024;
+
+      services.openssh = {
+        enable = true;
+        permitRootLogin = "yes";
+      };
+
+      environment.systemPackages = [
+        (pkgs.writeScriptBin "mail-check" ''
+          ${pkgs.python3}/bin/python ${../scripts/mail-check.py} $@
+        '')];
+
+      environment.etc.bind-password.text = bindPassword;
+
+      services.openldap = {
+        enable = true;
+        settings = {
+          children = {
+            "cn=schema".includes = [
+              "${pkgs.openldap}/etc/schema/core.ldif"
+              "${pkgs.openldap}/etc/schema/cosine.ldif"
+              "${pkgs.openldap}/etc/schema/inetorgperson.ldif"
+              "${pkgs.openldap}/etc/schema/nis.ldif"
+            ];
+            "olcDatabase={1}mdb" = {
+              attrs = {
+                objectClass = [
+                  "olcDatabaseConfig"
+                  "olcMdbConfig"
+                ];
+                olcDatabase = "{1}mdb";
+                olcDbDirectory = "/var/lib/openldap/example";
+                olcSuffix = "dc=example";
+              };
+            };
+          };
+        };
+        declarativeContents."dc=example" = ''
+          dn: dc=example
+          objectClass: domain
+          dc: example
+
+          dn: cn=mail,dc=example
+          objectClass: organizationalRole
+          objectClass: simpleSecurityObject
+          objectClass: top
+          cn: mail
+          userPassword: ${bindPassword}
+
+          dn: ou=users,dc=example
+          objectClass: organizationalUnit
+          ou: users
+
+          dn: cn=alice,ou=users,dc=example
+          objectClass: inetOrgPerson
+          cn: alice
+          sn: Foo
+          mail: alice@example.com
+          userPassword: ${alicePassword}
+
+          dn: cn=bob,ou=users,dc=example
+          objectClass: inetOrgPerson
+          cn: bob
+          sn: Bar
+          mail: bob@example.com
+          userPassword: ${bobPassword}
+        '';
+      };
+
+      mailserver = {
+        enable = true;
+        fqdn = "mail.example.com";
+        domains = [ "example.com" ];
+        localDnsResolver = false;
+
+        ldap = {
+          enable = true;
+          uris = [
+            "ldap://"
+          ];
+          bind = {
+            dn = "cn=mail,dc=example";
+            passwordFile = "/etc/bind-password";
+          };
+          searchBase = "ou=users,dc=example";
+          searchScope = "sub";
+        };
+
+        vmailGroupName = "vmail";
+        vmailUID = 5000;
+
+        enableImap = false;
+      };
+    };
+  };
+  testScript = ''
+    import sys
+    import re
+
+    machine.start()
+    machine.wait_for_unit("multi-user.target")
+
+    # This function retrieves the ldap table file from a postconf
+    # command.
+    # A key lookup is achived and the returned value is compared
+    # to the expected value.
+    def test_lookup(postconf_cmdline, key, expected):
+      conf = machine.succeed(postconf_cmdline).rstrip()
+      ldap_table_path = re.match('.* =.*ldap:(.*)', conf).group(1)
+      value = machine.succeed(f"postmap -q {key} ldap:{ldap_table_path}").rstrip()
+      try:
+        assert value == expected
+      except AssertionError:
+        print(f"Expected {conf} lookup for key '{key}' to return '{expected}, but got '{value}'", file=sys.stderr)
+        raise
+
+    with subtest("Test postmap lookups"):
+      test_lookup("postconf virtual_mailbox_maps", "alice@example.com", "alice@example.com")
+      test_lookup("postconf -P submission/inet/smtpd_sender_login_maps", "alice@example.com", "alice@example.com")
+
+      test_lookup("postconf virtual_mailbox_maps", "bob@example.com", "bob@example.com")
+      test_lookup("postconf -P submission/inet/smtpd_sender_login_maps", "bob@example.com", "bob@example.com")
+
+    with subtest("Test doveadm lookups"):
+      machine.succeed("doveadm user -u alice@example.com")
+      machine.succeed("doveadm user -u bob@example.com")
+
+    with subtest("Files containing secrets are only readable by root"):
+      machine.succeed("ls -l /run/postfix/*.cf | grep -e '-rw------- 1 root root'")
+      machine.succeed("ls -l /run/dovecot2/dovecot-ldap.conf.ext | grep -e '-rw------- 1 root root'")
+
+    with subtest("Test account/mail address binding"):
+      machine.fail(" ".join([
+        "mail-check send-and-read",
+        "--smtp-port 587",
+        "--smtp-starttls",
+        "--smtp-host localhost",
+        "--smtp-username alice@example.com",
+        "--imap-host localhost",
+        "--imap-username bob@example.com",
+        "--from-addr bob@example.com",
+        "--to-addr aliceb@example.com",
+        "--src-password-file <(echo '${alicePassword}')",
+        "--dst-password-file <(echo '${bobPassword}')",
+        "--ignore-dkim-spf"
+      ]))
+      machine.succeed("journalctl -u postfix | grep -q 'Sender address rejected: not owned by user alice@example.com'")
+
+    with subtest("Test mail delivery"):
+      machine.succeed(" ".join([
+        "mail-check send-and-read",
+        "--smtp-port 587",
+        "--smtp-starttls",
+        "--smtp-host localhost",
+        "--smtp-username alice@example.com",
+        "--imap-host localhost",
+        "--imap-username bob@example.com",
+        "--from-addr alice@example.com",
+        "--to-addr bob@example.com",
+        "--src-password-file <(echo '${alicePassword}')",
+        "--dst-password-file <(echo '${bobPassword}')",
+        "--ignore-dkim-spf"
+      ]))
+  '';
+}

tests/minimal.nix

@@ -14,9 +14,9 @@
 #  You should have received a copy of the GNU General Public License
 #  along with this program. If not, see <http://www.gnu.org/licenses/>
 
-import <nixpkgs/nixos/tests/make-test.nix> {
+import <nixpkgs/nixos/tests/make-test-python.nix> {
 
-  machine =
+  nodes.machine =
     { config, pkgs, ... }:
     {
         imports = [
@@ -26,6 +26,6 @@ import <nixpkgs/nixos/tests/make-test.nix> {
 
   testScript =
     ''
-      $machine->waitForUnit("multi-user.target");
+      machine.wait_for_unit("multi-user.target");
     '';
 }

tests/multiple.nix

@@ -0,0 +1,89 @@
+# This tests is used to test features requiring several mail domains.
+
+{ pkgs ? import <nixpkgs> {}, ...}:
+
+let
+    hashPassword = password: pkgs.runCommand
+      "password-${password}-hashed"
+      { buildInputs = [ pkgs.mkpasswd ]; inherit password; }
+      ''
+        mkpasswd -sm bcrypt <<<"$password" > $out
+      '';
+
+    password = pkgs.writeText "password" "password";
+
+    domainGenerator = domain: { config, pkgs, ... }: {
+      imports = [../default.nix];
+      virtualisation.memorySize = 1024;
+      mailserver = {
+        enable = true;
+        fqdn = "mail.${domain}";
+        domains = [ domain ];
+        localDnsResolver = false;
+        loginAccounts = {
+          "user@${domain}" = {
+            hashedPasswordFile = hashPassword "password";
+          };
+        };
+        enableImap = true;
+        enableImapSsl = true;
+      };
+      services.dnsmasq = {
+        enable = true;
+        # Fixme: once nixos-22.11 has been removed, could be replaced by
+        # settings.mx-host = [ "domain1.com,domain1,10" "domain2.com,domain2,10" ];
+        extraConfig = ''
+          mx-host=domain1.com,domain1,10
+          mx-host=domain2.com,domain2,10
+        '';
+      };
+    };
+
+in
+
+pkgs.nixosTest {
+  name = "multiple";
+  nodes = {
+    domain1 = {...}: {
+      imports = [
+        ../default.nix
+        (domainGenerator "domain1.com")
+      ];
+      mailserver.forwards = {
+        "non-local@domain1.com" = ["user@domain2.com" "user@domain1.com"];
+        "non@domain1.com" = ["user@domain2.com" "user@domain1.com"];
+      };
+    };
+    domain2 = domainGenerator "domain2.com";
+    client = { config, pkgs, ... }: {
+      environment.systemPackages = [
+        (pkgs.writeScriptBin "mail-check" ''
+          ${pkgs.python3}/bin/python ${../scripts/mail-check.py} $@
+        '')];
+    };
+  };
+  testScript = ''
+    start_all()
+
+    domain1.wait_for_unit("multi-user.target")
+    domain2.wait_for_unit("multi-user.target")
+
+    # TODO put this blocking into the systemd units?
+    domain1.wait_until_succeeds(
+        "set +e; timeout 1 ${pkgs.netcat}/bin/nc -U /run/rspamd/rspamd-milter.sock < /dev/null; [ $? -eq 124 ]"
+    )
+    domain2.wait_until_succeeds(
+        "set +e; timeout 1 ${pkgs.netcat}/bin/nc -U /run/rspamd/rspamd-milter.sock < /dev/null; [ $? -eq 124 ]"
+    )
+
+    # user@domain1.com sends a mail to user@domain2.com
+    client.succeed(
+        "mail-check send-and-read --smtp-port 587 --smtp-starttls --smtp-host domain1 --from-addr user@domain1.com --imap-host domain2 --to-addr user@domain2.com --src-password-file ${password} --dst-password-file ${password} --ignore-dkim-spf"
+    )
+
+    # Send a mail to the address forwarded and check it is in the recipient mailbox
+    client.succeed(
+        "mail-check send-and-read --smtp-port 587 --smtp-starttls --smtp-host domain1 --from-addr user@domain1.com --imap-host domain2 --to-addr non-local@domain1.com --imap-username user@domain2.com --src-password-file ${password} --dst-password-file ${password} --ignore-dkim-spf"
+    )
+  '';
+}