diff --git a/nixos/modules/services/web-apps/alps.nix b/nixos/modules/services/web-apps/alps.nix
index b171729fd0a3..b73cb82925d9 100644
--- a/nixos/modules/services/web-apps/alps.nix
+++ b/nixos/modules/services/web-apps/alps.nix
@@ -54,7 +54,7 @@ in {
     smtps = {
       port = mkOption {
         type = types.port;
-        default = 445;
+        default = 465;
         description = lib.mdDoc ''
           The SMTPS server port.
         '';