On Tue, 12 Jul 2011 13:33:40 +0000, Lars Jørgensen wrote:
This is not exactly what you asked for, but it solved the backscatter
problems for our users:

http://www.backscatterer.org/

That looks interesting, however if I put this in master.cf:

smtp      inet  n       -       n       -       -       smtpd
    -o content_filter=amavisfeed:[127.0.0.1]:10024
    -o smtpd_recipient_restrictions=check_sender_access
dbm:/etc/postfix/check_backscatterer

I get this:

postfix/smtpd[22684]: fatal: parameter
"smtpd_recipient_restrictions": specify at least one working instance
of: check_relay_domains, reject_unauth_destination, reject, defer or
defer_if_permit

It seems I am missing something? I know this question probably belong
to the backscatterer.org people, but as you know of it, maybe you can
be of assistance.

the above is a plain open-relay mta, dont doit

to fix, make sure you use reject_unauth_destinaion before any postconf -m

postfix restrictions is first match wins, remember this then its not hard to fix the above

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