Code Blue TOOLVOX X3 - Manual (Page 122)

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ToolVox® X3
Administrator Guide
option correlates to the smtpd_banner directive and contains $myhostname ESMTP $mail_name by
default.
Note
A proposed federal law in the U.S. would make it illegal to send unsolicited commercial
email through a mail server if the server included in its SMTP greeting the words NO UCE.
Max number of recipients accepted for delivery
This option limits the number of recipients that may be specified in a single message header. It
is usually rare for legitimate messages to have an extremely large number of recipients specified
in a single message header, but it is often done in UCE messages. The legitimate exception is
messages to a mailing list, possibly sent by mailing list software like majordomo or mailman. This
option correlates to the smtpd_recipient_limit and defaults to 1000.
Disable SMTP VRFY command
Normally, the SMTP VRFY command is used to verify the existence of a particular user. However, it
is also illegitimately used by spammers to harvest live email addresses. Thus, it is sometimes useful
to disable this command. This option correlates to disable_vrfy_command and defaults to No.
Timeout in seconds for SMTP transactions
This option sets the timeout for a client to respond to the SMTP servers response with an SMTP
request. The connection process involves the client opening a connection to the server, the server
replying with a greeting and the client making its request. If the client request does not come within
the time specified here, the connection will be closed. This option correlates to the opts_smtpd_
timeout directive and defaults to 300 seconds.
Timeout before sending 4xx/5xx error response
When sending an error response to a client, the server will sleep for a specified time. The purpose
of this feature is to prevent certain buggy clients from hitting the server with repeated requests in
rapid succession. This option correlates to the smtpd_error_sleep_time directive and defaults to 5
seconds.
Error count for temporarily ignore a client
This option configures the number of errors that a client may generate before Postfix will stop
responding to requests for a specified time. Some buggy mail clients may send a large number of
requests, while ignoring or responding incorrectly to the error messages that result. Postfix attempts
to minimize the impact of these buggy clients on normal service. This option correlates to the
smtpd_soft_error_limit and defaults to 10.
Error count for closing connection
If the number exceeds this limit, the connection will be closed. This option correlates to the smtpd_
hard_error_limit and defaults to 100.