Bypassing qmail-scanner/SpamAssassin on a (Plesk) xinetd based setup

Hello all,

This issue has been bugging me for ages, but I never found a solution to this. I just subscribed to this list and I hope someone here can help out.

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THE SETUP
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We have servers that run CentOS with Plesk 9 and its (xinetd based) qmail distribution. On top of that we use the qmail-scanner package from the atomic repository at atomicorp.com with their SpamAssassin and ClamAV packages.

This is a typical list of installed RPM packages and their versions on such a server:

centos-release-5-5.el5.centos.x86_64
psa-qmail-1.03-cos5.build95101209.08.x86_64
qmail-scanner-2.08-3.el5.art.x86_64
spamassassin-3.3.1-1.el5.art.x86_64
clamd-0.97-1.el5.art.x86_64

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THE PROBLEM
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All is working fine with this setup, except that e-mail messages which are sent using SMTP auth regularly get tagged as spam (for instance because clients are sending e-mail from home DSL connections which are listed on various RBL's). Do you know of any way that qmail-scanner could distinguish between a message that was submitted locally using SMTP auth and a message that was not? If that is possible, then I guess it should be possible to have qmail-scanner skip those messages or otherwise have SpamAssassin not be so hard on those messages. Any pointers on getting this to work are welcome.

If you need any more info on this setup, let me know.

Thanks,

Nils Breunese.
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