diff --git a/nix-system-configs/modules/system/mail-server.nix b/nix-system-configs/modules/system/mail-server.nix
index 2ad3f19..b482176 100644
--- a/nix-system-configs/modules/system/mail-server.nix
+++ b/nix-system-configs/modules/system/mail-server.nix
@@ -154,5 +154,12 @@ in {
         };
       };
     };
+
+        networking.firewall.allowedTCPPorts = [
+            25
+        ];
+        networking.firewall.allowedUDPPorts = [
+            25
+        ];
   };
 }