Migrate the mail config to the nixos module

mailserver.nix

@@ -1,14 +1,28 @@
 { config, pkgs, ... }:
 
+let mymailserver = (import <nixpkgs> {}).pkgs.fetchgit {
+    url = "https://codeberg.org/tokudan/nixos-mailserver.git";
+    rev = "15c419d488d1f4148f268d62fce0975f5a88a464";
+    sha256 = "111xjmcvr7gq4406yxdj87wvi8psq3dhb7shkdsj5d4bdr9kr13q";
+  };
+in
+
 {
   # Import some configuration as they are too long to be easily readable here
   imports = [ 
-    ./dovecot.nix
-    ./postfix.nix
-    ./postfixadmin.nix
-    ./roundcube.nix
-    ./rspamd.nix
+    #./dovecot.nix
+    #./postfix.nix
+    #./postfixadmin.nix
+    #./roundcube.nix
+    #./rspamd.nix
+    "${mymailserver}/default.nix"
   ];
+  networking.domain = "hamburg.freifunk.net";
+  services.mymailserver = {
+    enable = true;
+    adminAddress = "kontakt@hamburg.freifunk.net";
+    mailFQDN = "mail2.hamburg.freifunk.net";
+  };
   users.groups."${config.variables.vmailGroup}" = { gid = config.variables.vmailGID; };
   users.users."${config.variables.vmailUser}" = {
     uid = config.variables.vmailUID;