SPAM Bounce

[Spicer, Kevin]

>.  I
> am no linux/sendmail whatever expert so was not real sure 
> what all was going
> on.
> 
What you are seeing is most probably a side effect of the bounce action working as designed!  This happens because MailScanner processes the message after it has been accepted by the MTA - therefore it can only 'bounce' a message by _sending_ a rejection message, rather than by simply _rejecting_ the message instead of accepting it (like an MTA would do).  Of course, as spammers often forge the headers, many of these rejection messages would be undeliverable - which results in a message to the postmaster.

There is a rather useful script by David While which can dynamically update the sendmail access database to get the MTA to block persistent spammers (as well as producing some rather nifty stats), which you might like to look at (http://staff.cie.uce.ac.uk/~dwhile/mailstats/ ).  Maybe using this in conjunction with the MS bounce action would help your spam problem whilst cutting down the number of postmaster messages you get.  



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