SMTP 214 Help Message vs 500 Syntax Error
SMTP 214 (Help Message) is a 2xx Positive Completion response, while 500 (Syntax Error) 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, 500 means that the server could not recognize the command due to a syntax error. The command line was malformed or the command is not recognized by this server.
Description
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.
Quand vous le voyez
After sending the HELP command to the SMTP server. The response lists available commands or provides usage details for the command you specified.
Comment résoudre
No fix needed — this is a normal informational response. Use the provided help text to understand which commands the server supports.
Description
The server could not recognize the command due to a syntax error. The command line was malformed or the command is not recognized by this server.
Quand vous le voyez
When you send a command the server does not understand — often due to a typo, unsupported command, or an excessively long line.
Comment résoudre
Check the command spelling and syntax against the SMTP specification. Ensure the command line does not exceed 512 characters and uses proper CRLF line endings.
Différences clés
214 is a 2xx Positive Completion response, while 500 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 500: The server could not recognize the command due to a syntax error. The command line was malformed or the command is not recognized by this server.
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 500 when when you send a command the server does not understand — often due to a typo, unsupported command, or an excessively long line.
Quand utiliser lequel
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 500 (Syntax Error): Check the command spelling and syntax against the SMTP specification. Ensure the command line does not exceed 512 characters and uses proper CRLF line endings.