feat: this should put an automatic bcc on outgoing mail as well as a corrosponding filter to put it in teh right inboxes

Relates to #84

applications/email.nix

@@ -114,6 +114,21 @@ with lib; let
               stop;
             } else {
               fileinto :create "''${1}";
+              stop;
+            }
+          }
+      }
+      if allof (
+          address  :localpart ["From"] ["${toString create_config_to}"],
+          address  :domain ["From"] "skynet.ie"
+          ){
+          if address :matches ["From"] "*@skynet.ie" {
+            if header :is "X-Spam" "Yes" {
+              fileinto :create "''${1}.Junk";
+              stop;
+            } else {
+              fileinto :create "''${1}";
+              stop;
             }
           }
       }
@@ -465,6 +480,39 @@ in {
       before = configFile;
     };
 
+    # This is to add a bcc to outgoing mail
+    # this then interacts with teh filters to put it in the right folder
+    # we can directly add to the postfix service here
+    services.postfix = let
+      # mostly copied from the upstream mailserver config/functions
+      mappedFile = name: "hash:/var/lib/postfix/conf/${name}";
+
+      sender_bcc_maps_file = let
+        content = lookupTableToString create_skynet_service_bcc;
+      in
+        builtins.toFile "sender_bcc_maps" content;
+
+      lookupTableToString = attrs: let
+        valueToString = value: lib.concatStringsSep ", " value;
+      in
+        lib.concatStringsSep "\n" (lib.mapAttrsToList (name: value: "${name} ${valueToString value}") attrs);
+
+      # convert the mailboxes config to something that can be used here
+      create_skynet_email_bcc = mailbox: {
+        name = "${mailbox}@skynet.ie";
+        value = ["${mailbox}@skynet.ie"];
+      };
+      create_skynet_service_bcc = builtins.listToAttrs (map (mailbox: (create_skynet_email_bcc mailbox.account)) service_mailboxes);
+    in {
+      mapFiles."sender_bcc_maps" = sender_bcc_maps_file;
+
+      config = {
+        sender_bcc_maps = [
+          (mappedFile "sender_bcc_maps")
+        ];
+      };
+    };
+
     # tune the spam filter
     /*
     services.rspamd.extraConfig = ''