diff --git a/modules/nixos/zulip.nix b/modules/nixos/zulip.nix
index a2b814c..5aec8eb 100644
--- a/modules/nixos/zulip.nix
+++ b/modules/nixos/zulip.nix
@@ -26,8 +26,8 @@
 
       # configure mailserver port
       EMAIL_HOST = config.mailserver.fqdn;
-      EMAIL_USE_TLS = true;
-      EMAIL_PORT = 587; # non-secure port
+      EMAIL_USE_SSL = true;
+      EMAIL_PORT = 465;
 
       # setting to allow realm creation; probably unsafe, might delete later :3
       OPEN_REALM_CREATION = true;
@@ -41,7 +41,4 @@
       EXTERNAL_HOST = config.services.zulip.host;
     };
   };
-
-  # needed for non-secure connection through port 587
-  mailserver.enableSubmissionSsl = true;
 }