From: Charles Marcus (CMarcusMedia-Brokers.com)
Date: Sun Apr 18 2010 - 07:37:21 CDT

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On 2010-04-18 8:10 AM, Marcus Frischherz wrote:
> The spam gets filtered alright by spamassassin, and then it bounces, but
> it doesn't bounce to the actual real originator, but to the local user.
> So in this way the spammer manages to deliver the spam to the addrassee,
> although it is filtered my spamassassin, abusing the bounce concept.

That is your problem. Either set up your anti-spam filter as a pre-queue
filter, so you can smtp reject it, rather than accept>bounce it, or do
*not* bounce it but deliver it tagged and/or to a spam folder.

What you are enagging in is called backscatter, and can eventually get
you blacklisted if your server is high enough volume:

http://www.postfix.org/BACKSCATTER_README.html

--

Best regards,

Charles

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