211
SMTP
211 System Status
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.
Quand vous voyez ce code
When querying the mail server for its status or capabilities. The server is sharing diagnostic or informational details about itself.
Comment résoudre
No fix needed — this is an informational response. If the status indicates a problem, review the server's configuration or contact the mail administrator.