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golemwashere
Asked: 2013-09-14 00:13:04 +0800 CST

postfix: blocking a certain sender for a certain receiver

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I have a postfix installation with amavis and postfwd. I'd like to block a single sender only for a single receiver. I tried with header_checks but multiline checking I was thinking something like

id=BLOCKIT
[email protected]; [email protected]; action=REJECT no sender

on postfwd but I can't find the proper syntax... Has anyone some suggestions?

postfix

2 Answers

  1. I don't know how to do this in postfwd, but within Postfix, you can use Restriction Classes for this. If you e.g. want to prevent [email protected] to send mail to your user [email protected]:

    smtpd_restriction_Classes = mail_for_alice
mail_for_alice = check_sender_access hash:/etc/postfix/mail_for_alice
smtpd_recipient_restrictions =
  ...
  check_recipient_access hash:/etc/postfix/special_recipients

    The file special_recipients would contain a line like

    [email protected] mail_for_alice

    And mail_for_alice would contain:

    [email protected] reject

    That said, you are probably better of with doing all of this in postfwd ;-)

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  2. I have accomplished similar tasks using Postgrey. You could install postgrey and disable the greylisting feature, but retain the whitelist and blacklist features. Many people find Postgrey intrusive, I find it to be a nearly perfect spam filter.

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