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Don't do this. Most spam forge the From line. If you bounce to it, you'll likely just be contributing to the \[http://catb.org/~esr/jargon/html/J/joe-job.html Joe Job\] of some innocent soul. If you want to bounce messages (so that senders know it didn't reach you), you need to do it at the MTA level as described above. |
Qmail
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If you're using qmail (see [IntegratedInMta]), you can set up [SpamAssassin] through Qmail-Scanner, which has a patched version able to delete spam at a given threshold. Here's the patched \[http://xoomer.virgilio.it/j.toribio/qmail-scanner/ version\] and the \[http://qmail-scanner.sourceforge.net original\]. |
Challenge-response and Email passwords
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