postfix mail filtering with amavisd-milter - works!

Alexander Wirt formorer at
Thu Jan 31 08:42:47 CET 2013

Patrick Ben Koetter schrieb am Thursday, den 31. January 2013:

> * Jo Rhett <jrhett at>:
> > So I've been a sendmail admin for 20+ years and never saw any need for
> > postfix. I was very happy with sendmail and amavisd-milter and amavisd.
> > However, when rebuilding my colo box I decided to go ahead and learn
> > postfix, just so I can see how the other half lives ;-)
> > 
> > First, I found that all of the published recipes for spam containment with
> > postfix are bogus. They either create back-scatter, or they drop messages
> > which hit the filter instead of rejecting them in the SMTP session like they
> > are supposed to. So if something is a false positive, the far side will
> > never know it happened. Neither of these situations is playing fair to other
> > parties.
> > 
> > So I've done some testing and work, and I currently have postfix using
> > amavisd-milter as a before-queue spam test, which properly rejects spam
> > during the SMTP session. This solves both of the previous problems and
> > brings postfix users closer to being a proper mail gateway. I believe very
> > strongly that this recipe should replace the existing documentation, to
> > avoid sending new users out to become backscatters.
> Agreed. I will expand the documentation as my time permits. There's good
> reason to keep both approaches. Some countries don't see the need to do
> pre-queue filtering; they have different ideas of a good [TM] content filter
> policy.
Or reliable filters under heavy load ;)

Alexander Wirt, formorer at 
CC99 2DDD D39E 75B0 B0AA  B25C D35B BC99 BC7D 020A

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