networking to module

default.nix

@@ -251,6 +251,7 @@ in
     ./mail-server/clamav.nix
     ./mail-server/users.nix
     ./mail-server/environment.nix
+    ./mail-server/networking.nix
   ];
 
   config = mkIf cfg.enable {
@@ -261,16 +262,11 @@ in
               certificateScheme certificateFile keyFile certificateDirectory virusScanning;
     };
 
-    networking = import ./mail-server/networking.nix {
-      inherit (cfg) domain hostPrefix enableImap enablePop3;
-    };
-
     systemd = import ./mail-server/systemd.nix {
       inherit pkgs;
       inherit (cfg) mailDirectory vmailGroupName certificateScheme
       certificateDirectory
               hostPrefix domain dkimSelector dkimKeyDirectory;
     };
-
   };
 }

mail-server/networking.nix

@@ -14,15 +14,21 @@
 #  You should have received a copy of the GNU General Public License
 #  along with this program. If not, see <http://www.gnu.org/licenses/>
 
-{ domain, hostPrefix, enableImap, enablePop3 }:
+{ config, pkgs, lib, ... }:
 
+let
+  cfg = config.mailserver;
+in
 {
-  #hostName = "${hostPrefix}.${domain}";
+  config = with cfg; lib.mkIf enable {
 
-  firewall = {
+    networking.hostName = "${hostPrefix}.${domain}";
+
+    networking.firewall = {
       enable = true;
       allowedTCPPorts = [ 25 587 ]
         ++ (if enableImap then [ 143 ] else [])
         ++ (if enablePop3 then [ 110 ] else []);
     };
+  };
 }