diff --git a/mail-server.nix b/mail-server.nix
index 666a2c3..d6d9aee 100644
--- a/mail-server.nix
+++ b/mail-server.nix
@@ -39,4 +39,10 @@ in
   
   # define all users
   users.extraUsers = vmail_user ++ mail_user;
+  
+  # postfix
+  services.postfix = {
+    enable = true;
+    networksStyle = "host";
+  };
 }