diff --git a/core/admin/mailu/internal/nginx.py b/core/admin/mailu/internal/nginx.py
index 6c320ae4..cf24e12f 100644
--- a/core/admin/mailu/internal/nginx.py
+++ b/core/admin/mailu/internal/nginx.py
@@ -19,7 +19,7 @@ STATUSES = {
     }),
     "encryption": ("Must issue a STARTTLS command first", {
         "imap": "PRIVACYREQUIRED",
-        "smtp": "530 5.7.0"
+        "smtp": "530 5.7.0",
         "submission": "530 5.7.0",
         "pop3": "-ERR Authentication canceled.",
         "sieve": "ENCRYPT-NEEDED"