F-Secure Internet Gatekeeper for Linux/Administrator’s Guide
148
11.8
SMTP Command Responses
Usually, server responses are relayed to clients during SMTP connections. However, sometimes they
can be generated by F-Secure Internet Gatekeeper for Linux. The product generates the following
messages:
[Response message] (Product name)
(Example: 500 Unknown Command: "TEST" (F-Secure/fsigk_smtp/230/gwdev.gw.f-secure.co.jp))
DATA command response
Message
354 Enter mail
Reason
Starts to receive e-mail data that is being transferred.
Message
250 Message accepted for delivery
Reason
Indicates that the e-mail data has been received.
Message
554 SENDBACK:smtp error[COMMAND] (Server Reply: XXX)
Reason
Indicates that an error response (XXX) was returned for the sendback command
(COMMAND) used to notify the sender.
COMMAND can be either RSET/MAIL or FROM/RCPT TO.
Message
250 Message accepted for delivery
Reason
Indicates that the e-mail data has been received.
Message
554 Too long message
Reason
The data size has exceeded the maximum.
The maximum size is 2 GB, or the value specified at
block_messagesize/block_message_len in the expert options.
Message
554 Infected by [Detection name]
Reason
This message appears when a virus is detected and if “Deny” is selected as the action
when viruses are detected.
Connection responses
Message
421 server open error (Host port) errmsg=[XXX]
Reason
Access to the specified host and port failed.
ERRMSG displays the contents covered in “
Connection Error Messages
”, 164.
Message
421 Cannot get correct greeting message from mail server (Host port). return code=DDD
Reason
The greeting message after connecting to the SMTP server is invalid. Is displayed if the
response code from the SMTP server is not 220.