Linux Spam filtering

I setup a Linux box to be my pop & smtp server.  I need to know an easy, yet effective way to implement a filtering program to stop spam.
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There are a few different approaches you can take.  For example, sendmail configuration options can be set in order to disallow certain types of mail to pass through.  Alternately, you can set up user-by-user filtering via procmail (which is often the default MDA - mail delivery agent - on RedHat and Mandrake systems).  Check out and also consult a comprehensive sendmail book for more details.  You should run sendmail 8.9.x or newer if you are indeed using sendmail at your site, because of some new anti-spam-relay logic in the newer sendmail configuration.
An easy yet effective way to reduce spam is to use MAPS RBL (the Mail Abuse Prevention System Realtime Blackhole List) Check out

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