diff --git a/sys/mailserver/mailserver.nix b/sys/mailserver/mailserver.nix
index d67164b..8f32c44 100644
--- a/sys/mailserver/mailserver.nix
+++ b/sys/mailserver/mailserver.nix
@@ -71,7 +71,7 @@
 
   networking.firewall = {
     enable = true;
-    allowedTCPPorts = [ 80 ];
+    allowedTCPPorts = [ 80 443 ];
   };
 
   mailserver = {