diff --git a/mastus/configuration.nix b/mastus/configuration.nix
index 925650a..964cb93 100644
--- a/mastus/configuration.nix
+++ b/mastus/configuration.nix
@@ -46,7 +46,7 @@
       80 443
 
       # mail
-      25 143
+      25 993
     ];
   };