SMTP 211 System Status vs 251 User Not Local
Both SMTP 211 (System Status) and 251 (User Not Local) 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, 251 means that the recipient is not local to the server, but it will forward the message to the specified forwarding address. The server acts as a relay for this recipient.
विवरण
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.
जब आप इसे देखें
When querying the mail server for its status or capabilities. The server is sharing diagnostic or informational details about itself.
कैसे ठीक करें
No fix needed — this is an informational response. If the status indicates a problem, review the server's configuration or contact the mail administrator.
विवरण
The recipient is not local to the server, but it will forward the message to the specified forwarding address. The server acts as a relay for this recipient.
जब आप इसे देखें
When sending to a recipient whose mailbox is hosted on a different server. The current server knows the forwarding address and will relay the message on your behalf.
कैसे ठीक करें
No fix needed — the message will be forwarded automatically. To avoid relaying, send directly to the address provided in the server's response.
मुख्य अंतर
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 251: The recipient is not local to the server, but it will forward the message to the specified forwarding address. The server acts as a relay for this recipient.
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 251 when when sending to a recipient whose mailbox is hosted on a different server. The current server knows the forwarding address and will relay the message on your behalf.
कब किसका उपयोग करें
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 251 (User Not Local): No fix needed — the message will be forwarded automatically. To avoid relaying, send directly to the address provided in the server's response.