SMTP 211 System Status vs 221 Closing Connection
Both SMTP 211 (System Status) and 221 (Closing Connection) belong to the 2xx Positive Completion category. 211 indicates that a system status reply providing information about the mail server's current state. This is typically sent in response to a HELP or system inquiry 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.
Açıklama
A system status reply providing information about the mail server's current state. This is typically sent in response to a HELP or system inquiry command.
Gördüğünüzde
When querying the mail server for its status or capabilities. The server is sharing diagnostic or informational details about itself.
Nasıl Düzeltilir
No fix needed — this is an informational response. If the status indicates a problem, review the server's configuration or contact the mail administrator.
Açıklama
The server is closing the transmission channel. This is the normal response to the QUIT command, indicating a graceful end to the SMTP session.
Gördüğünüzde
After sending the QUIT command at the end of a mail session. The server acknowledges the disconnect and the TCP connection will be closed.
Nasıl Düzeltilir
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.
Temel Farklar
SMTP 211: A system status reply providing information about the mail server's current state. This is typically sent in response to a HELP or system inquiry 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 211 when when querying the mail server for its status or capabilities. The server is sharing diagnostic or informational details about itself.
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.
Hangisini Ne Zaman Kullanmalı
For 211 (System Status): No fix needed — this is an informational response. If the status indicates a problem, review the server's configuration or contact the mail administrator. 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.