system
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I use MailWasher Pro 4.1
No problems at all and it works great with avast!
Spamkiller is also good one, but MacLover just reported some problems with that software ( link: http://forum.avast.com/index.php?board=2;action=display;threadid=5232 )…
My advice: stick to MailWasher, you can’t go wrong.
Greetz !