F-Secure Internet Gatekeeper for Linux/Administrator’s Guide
149
Other command responses
Message
500 Too long line
Reason
The length of the command line exceeds 9999 bytes.
Responses from commands other than HELO, EHLO, AUTH, QUIT, RSET
Message
500 Authentication Required"
Reason
The authentication for sending e-mails is not complete. Is displayed in the following
cases:
- If POP-before-SMTP or SMTP authentication is enabled
- Authentication is not successful
- The connection is not from the LAN
- Recipient domain restrictions are not applied
HELO/EHLO command responses
Message
421 (COMMAND) disconnected from (Host: Port)
Reason
The server was disconnected when COMMAND was executed.
The COMMAND can be either HELO or EHLO.
MAIL command responses
Message
501 Syntax error ("MAIL FROM:").
Reason
The MAIL command is invalid (FROM is missing).
RCPT command responses
Message
500 RCPT command must begin with "RCPT TO:.
Reason
The RCPT command is invalid (TO is missing).
Message
250 Recipient ok"
Reason
The relay was denied.
Is displayed when recipient domains are restricted and authentication is not completed.
AUTH command responses
Message
504 this mechanism not available
Reason
Authentication methods other than PLAIN and LOGIN are not supported.
Message
235 ok authed
Reason
Authentication is successful.
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
535 authorization failed