use non-tls ssl?

modules/nixos/zulip.nix

@@ -20,17 +20,14 @@
 
     # settings
     zulipSettings = rec {
-      # email settings
+      # email users
       ZULIP_ADMINISTRATOR = "admin@${config.networking.domain}";
       EMAIL_HOST_USER = ZULIP_ADMINISTRATOR;
 
       # configure mailserver port
       EMAIL_HOST = config.mailserver.fqdn;
-      EMAIL_USE_TLS = config.mailserver.enableSubmissionSsl;
-      EMAIL_PORT =
-        if config.mailserver.enableSubmissionSsl
-        then 465
-        else 587;
+      EMAIL_USE_TLS = false;
+      EMAIL_PORT = 587;
 
       # setting to allow realm creation; probably unsafe, might delete later :3
       OPEN_REALM_CREATION = true;
@@ -44,4 +41,7 @@
       EXTERNAL_HOST = config.services.zulip.host;
     };
   };
+
+  # needed fro non-tls connection through port 587
+  services.mailserver.enableSubmissionSsl = true;
 }