Fix the authentication behavior with non-existing users

core/admin/mailu/internal/nginx.py

@@ -11,7 +11,7 @@ STATUSES = {
     "authentication": ("Authentication credentials invalid", {
         "imap": "AUTHENTICATIONFAILED",
         "smtp": "535 5.7.8",
-        "pop3": ""
+        "pop3": "-ERR Authentication failed"
     }),
 }
 
@@ -52,7 +52,6 @@ def handle_authentication(headers):
                     "Auth-Server": server,
                     "Auth-Port": port
                 }
-        else:
         status, code = get_status(protocol, "authentication")
         return {
             "Auth-Status": status,
@@ -60,7 +59,6 @@ def handle_authentication(headers):
             "Auth-Wait": 0
         }
     # Unexpected
-    else:
     return {}