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Accepted
Larry G. Wapnitsky
Asked: 2012-04-17 10:13:24 +0800 CST

Postfix unknown command

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I'm running two milters on my current postfix installation. I'm noticing that, from one particular client, they are sending an invalid command consisting of the first 3 letters of their domain name. When postfix sees this, it causes my milters to exit out.

How can I proceed past this?

I've seen this on the postfix documentation, but am not sure how to apply it:

milter_unknown_command_macros (default: see "postconf -d" output)
The macros that are sent to version 3 or higher Milter (mail filter) applications after an unknown SMTP command. See MILTER_README for a list of available macro names and their meanings.

This feature is available in Postfix 2.3 and later.

Thanks

smtp postfix

1 Answers

  1. Best Answer

    You could use smtpd_command_filter to exclude these bogus commands:

    In /etc/postfix/main.cf:

    smtpd_command_filter = pcre:/etc/postfix/bogus_commands

    And in /etc/postfix/bogus_commands:

    /[^ ]{3}/ NOOP

    You may have to test the regex to fit your needs.

    There are no SMTP commands that consist of 3 letters :)

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