Chris Turan wrote:
Noel Jones wrote:
You need to configure postfix to reject unknown recipients during
SMTP. Switching to something other than amavisd-new and/or switching
to a before-queue filter won't help that.
Hey Noel. I actually am rejecting unknown recipients. I wrote some
software to refresh the recipients map every five minutes on my system.
amavisd-new meets all your criteria, providing you configure it to
tag+deliver mail rather than bounce.
Well, I also have it set to bounce messages with a spamassassin score
above 12. Turning that off and just delivering everything with tagging
*could* work. It would be highly annoying for my end users, however.
If you describe your problem in more detail, you will likely get more
specific recommendations in solving it.
Not sure what more I can add, but I'll give it a shot.
The backscatter is mostly messages with a spam score above 12. They're
being sent off to all sorts of off-site addresses. In addition, there
are some messages that has the sender address being set the same as the
recipient.
-Chris
Setting amavisd-new to tag+deliver with D_PASS will solve your
backscatter problem.
Use zen.spamhaus.org to reduce the number of spams entering
your system. Add clamav to amavisd-new if you don't have it
already, and use the Sanesecurity add-on signatures (in
addition to the official clamav signatures, of course).
If you want to investigate setting up amavisd-new as a
pre-queue filter, general instructions are here:
http://www.postfix.org/SMTPD_PROXY_README.html
More specific instructions can likely be found in the archives
of the amavis-users mail list.
--
Noel Jones
