I'd suggest postgrey, here the latest announcement:
http://lists.ee.ethz.ch/postgrey/msg00960.html

It's running stable since years for me, and there's very good support on
the (low volume) mailing list: [EMAIL PROTECTED]


 
I have had very good luck with Postfix & GLD(http://www.gasmi.net/gld.html).  It is very simple and has been very stable.  A good solution as long as you don't mind running MySQL.

--Bill

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