193 lines
5 KiB
Markdown
193 lines
5 KiB
Markdown
# ![Simple Nixos MailServer][logo]
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## Stable Releases
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None so far.
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[Latest Release Candidate](https://github.com/r-raymond/nixos-mailserver/releases/latest)
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## Features
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### v1.1
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* Postfix MTA
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- [x] smtp on port 25
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- [x] submission port 587
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- [x] lmtp with dovecot
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* Dovecot
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- [x] maildir folders
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- [x] imap starttls on port 143
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- [x] pop3 starttls on port 110
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* Certificates
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- [x] manual certificates
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- [x] on the fly creation
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* Spam Filtering
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- [x] via rspamd
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- [x] hard coded sieve script to move spam into Junk folder
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* Virus Scanning
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- [x] via clamav
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* DKIM Signing
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- [x] via opendkim
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* User Management
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- [x] declarative user management
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- [x] declarative password management
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### v1.2
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* Certificates
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- [x] Let's Encrypt
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* Sieves
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- [ ] Allow user defined sieve scripts
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* User Aliases
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- [ ] More complete alias support
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### v2.0
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* [ ] Multiple Domains
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### Changelog
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#### v1.0 -> v1.1
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* Changed structure to Nix Modules
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* Adds Sieve support
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### How to Deploy
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```nix
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{ config, pkgs, ... }:
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{
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imports = [
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(builtins.fetchTarball "https://github.com/r-raymond/nixos-mailserver/releases/tag/v1.1-rc3")
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];
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mailserver = {
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enable = true;
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domain = "example.com";
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login_accounts = {
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user1 = {
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name = "test";
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hashedPassword = "$6$Mmmx1U68$Twd8acMxqHoqFyfz3SPz1pzjY/D36gayAdpUTFMvfrHQUwObF3acuLz2GYAGFzsjHLEK/dPIv3pCwj3kZ5T2u.";
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};
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};
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virtualAliases = {
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admin = "user1";
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};
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};
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}
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```
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For a complete list of options, see `default.nix`.
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### How to Test
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You can test the setup via `nixops`. After installation, do
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```
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nixops create nixops/single-server.nix nixops/vbox.nix -d mail
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nixops deploy -d mail
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nixops info -d mail
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```
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You can then test the server via e.g. `telnet`. To log into it, use
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```
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nixops ssh -d mail mailserver
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```
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To test imap manually use
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```
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openssl s_client -host mail.example.com -port 143 -starttls imap
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```
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## How to Set Up a 10/10 Mail Server
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Mail servers can be a tricky thing to set up. This guide is supposed to run you
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through the most important steps to achieve a 10/10 score on `mail-tester.com`.
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### Fully Qualified Domain Name
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No matter how many domains you want to serve on your mail server, you need to
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settle on a _Fully Qualified Domain Name_ (FQDN) where your server is reachable,
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so that other servers can find yours. Common FQDN include `mx.example.com`
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(where `example.com` is a domain you own) or `mail.example.com`.
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After you settled on a FQDN (we will assume `mx.example.com` henceforth) you
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need to
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* Set a DNS entry on your domain to point to the IP of the server. For this
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add a DNS record such as
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| Name (Subdomain) | TTL | Type | Priority | Value |
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| ---------------- | ----- | ---- | -------- | ----------------- |
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| mx.example.com | 10800 | A | | `xxx.xxx.xxx.xxx` |
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to your domain, where `xxx.xxx.xxx.xxx` is the IP of your server.
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* Set a `rDNS` (reverse DNS) entry for your FQDN. You need to do so wherever
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you have rented your server. Make sure that `xxx.xxx.xxx.xxx` resolves to
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`mx.example.com`.
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### MX Record
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| Name (Subdomain) | TTL | Type | Priority | Value |
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| ---------------- | ----- | ---- | -------- | ----------------- |
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| domain1.com | | MX | 10 | mx.exmaple.com |
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### Spf record
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| Name (Subdomain) | TTL | Type | Priority | Value |
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| ---------------- | ----- | ---- | -------- | ----------------- |
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| domain1.com | 10800 | TXT | | `v=spf1 ip4:xxx.xxx.xxx.xxx -all` |
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### DKIM signature
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| Name (Subdomain) | TTL | Type | Priority | Value |
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| ---------------- | ----- | ---- | -------- | ----------------- |
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| dkim._domainkey.domain1.com | 10800 | TXT | | `v=DKIM1; p=yyyyyyyyyyyy` |
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where `yyyyyyyyyyyy` is the `DKIM` signature
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## A Complete Mail Server Without Moving Parts
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### Used Technologies
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* Nixos
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* Nixpkgs
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* Dovecot
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* Postfix
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* Rmilter
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* Rspamd
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* Clamav
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* Opendkim
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* Pam
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### Features
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* one domain
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* unlimited mail accounts
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* unlimited aliases for every mail account
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* spam and virus checking
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* dkim signing of outgoing emails
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* imap (optionally pop3)
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* startTLS
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### Nonfeatures
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* moving parts
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* SQL databases
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* configurations that need to be made after `nixos-rebuild switch`
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* complicated storage schemes
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* webclients / http-servers
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## Contributors
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* Special thanks to @Infinisil for the module rewrite
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* @danbst
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* @phdoerfler
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* @eqyiel
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### Credits
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* send mail graphic by [tnp_dreamingmao](https://thenounproject.com/dreamingmao)
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from [TheNounProject](https://thenounproject.com/) is licensed under
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[CC BY 3.0](http://creativecommons.org/~/3.0/)
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* Logo made with [Logomakr.com](https://logomakr.com)
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[logo]: logo/logo.png
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