SMTP 214 Help Message vs 221 Closing Connection
Both SMTP 214 (Help Message) and 221 (Closing Connection) belong to the 2xx Positive Completion category. 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. Meanwhile, 221 means that the server is closing the transmission channel. This is the normal response to the QUIT command, indicating a graceful end to the SMTP session.
Mô tả
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.
Khi bạn thấy mã này
After sending the HELP command to the SMTP server. The response lists available commands or provides usage details for the command you specified.
Cách khắc phục
No fix needed — this is a normal informational response. Use the provided help text to understand which commands the server supports.
Mô tả
The server is closing the transmission channel. This is the normal response to the QUIT command, indicating a graceful end to the SMTP session.
Khi bạn thấy mã này
After sending the QUIT command at the end of a mail session. The server acknowledges the disconnect and the TCP connection will be closed.
Cách khắc phục
No fix needed — this is the expected response when ending an SMTP session. If you see this unexpectedly, the server may be shutting down or timing out idle connections.
Sự khác biệt chính
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 221: The server is closing the transmission channel. This is the normal response to the QUIT command, indicating a graceful end to the SMTP session.
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 221 when after sending the QUIT command at the end of a mail session. The server acknowledges the disconnect and the TCP connection will be closed.
Khi nào dùng cái nào
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 221 (Closing Connection): No fix needed — this is the expected response when ending an SMTP session. If you see this unexpectedly, the server may be shutting down or timing out idle connections.