SMTP 214 Help Message vs 553 Mailbox Name Invalid
SMTP 214 (Help Message) is a 2xx Positive Completion response, while 553 (Mailbox Name Invalid) is a 5xx Permanent Negative response. 214 indicates that a help message response containing information about the server's supported commands or a specific command's usage. This is a human-readable reply to the HELP command. In contrast, 553 means that the requested action was not taken because the mailbox name is syntactically incorrect. The email address does not conform to the expected format.
विवरण
A help message response containing information about the server's supported commands or a specific command's usage. This is a human-readable reply to the HELP command.
जब आप इसे देखें
After sending the HELP command to the SMTP server. The response lists available commands or provides usage details for the command you specified.
कैसे ठीक करें
No fix needed — this is a normal informational response. Use the provided help text to understand which commands the server supports.
विवरण
The requested action was not taken because the mailbox name is syntactically incorrect. The email address does not conform to the expected format.
जब आप इसे देखें
When the sender or recipient address contains invalid characters, improper formatting, or violates the server's naming conventions.
कैसे ठीक करें
Check the email address format — ensure it follows the standard [email protected] pattern with valid characters. Remove any spaces, special characters, or encoding issues from the address.
मुख्य अंतर
214 is a 2xx Positive Completion response, while 553 is a 5xx Permanent Negative response.
SMTP 214: A help message response containing information about the server's supported commands or a specific command's usage. This is a human-readable reply to the HELP command.
SMTP 553: The requested action was not taken because the mailbox name is syntactically incorrect. The email address does not conform to the expected format.
You encounter 214 when after sending the HELP command to the SMTP server. The response lists available commands or provides usage details for the command you specified.
You encounter 553 when when the sender or recipient address contains invalid characters, improper formatting, or violates the server's naming conventions.
कब किसका उपयोग करें
For 214 (Help Message): No fix needed — this is a normal informational response. Use the provided help text to understand which commands the server supports. For 553 (Mailbox Name Invalid): Check the email address format — ensure it follows the standard [email protected] pattern with valid characters. Remove any spaces, special characters, or encoding issues from the address.