F-Secure Internet Gatekeeper for Linux/Administrator’s Guide
150
Reason
Authentication failed.
Is displayed only when SMTP authentication is performed by F-Secure Internet
Gatekeeper for Linux. If authentication is done on the SMTP server side, the SMTP
server response is relayed.
Message
500 disconnected from server(AUTH).
Reason
The server disconnected during authentication.
Unknown commands
Message
500 Unknown Command: "COMMAND"
Reason
The specified command (COMMAND) is not supported.