Re: postfix-to-mailman / possible backscatter

From: Ralf Hildebrandt (no email)
Date: Fri Apr 25 2008 - 08:39:38 EDT

  • Next message: Wietse Venema: "Re: postfix-to-mailman / possible backscatter"

    * Zbigniew Szalbot <>:

    > I am writing with the hope that some of you are using
    > postfix-to-mailman.py utility and would like to share how you have solved
    > the problem of possible backscatter. I have installed mailman a couple of
    > days ago and I am using postfix-tomailman.py script (I followed
    > instructions from http://www.purplehat.org/?page_id=18).
    >
    > When doing tests, I have noticed that with such setup, if I fake email
    > address and send to a non-existent address at lists.domain.tld, then
    > instead of rejecting postfix will bounce the mail. I believe this opens
    > door for backscatter. Has anyone implemented this script and took
    > measures to prevent such backscatter? If so, could you share how? If not,
    > I guess I will go the usuall route of generating necessary mailman
    > aliases. The advantage of the postfix-to-mailman.py script is that the
    > aliases are handled automatically (no need to generate them).

    relay_domains = proxy:mysql:/usr/local/etc/postfix/mysql_relay_domains_maps.cf
    lacks a corresponding
    relay_recipient_maps entry in main.cf which lists VALID addresses that
    may be relayed to mailman

    -- 
    Ralf Hildebrandt ()          
    Postfix - Einrichtung, Betrieb und Wartung       Tel. +49 (0)30-450 570-155
    http://www.arschkrebs.de
    Ballmer should step down in favour of Mr T, because he pity the fool
    who don't got high-end video cards and 4GB RAM for Vista Aero!
    

  • Next message: Wietse Venema: "Re: postfix-to-mailman / possible backscatter"





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