I am running Ubuntu 11.04 as a SOHO server with postfix/dovecot/Amavis-new/Spamassassin/Clamav setup as my email service.

I currently use header and body checks in postfix as part of my anti-spam measures.
How useful and/or how effective are these measures?
Are they still worthwhile if I am using the Amavis-new/Spamassassin/Clamav setup for anti-spam? The check files were originally from a third party (Jeff Posluns ?) and are fairly old, I have added some of my own checks but the basic files are originals. If these checks are still worthwhile are there more up to date files, and if so where might they be found?

TIA
John A

-- First they came for the Communists, but I was not a Communist so I did not speak out. Then they came for the Socialists and the Trade Unionists, but I was neither, so I did not speak out. Then they came for the Jews, but I was not a Jew so I did not speak out. And when they came for me, there was no one left to speak out for me. Dietrich Bonhoeffer - 1906-1945

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