Postfix & Spamassassin

[albans]

Hello,

I'm trying to figure out how to install/configure Spamassassin (without the plesk control-panel implementation, so not the psa-spamassassin, but the usual package spamassassin) to work with Plesk 9 and Postfix?

Any clue? Does a yum install spamassassin from ART (http://atomicrocketturtle.com) does it?

Until now, I could set the clamAV easily, I still have problems with greylisting.
FYI:
http://forum.parallels.com/showthread.php?t=86143&highlight=postfix
http://gnusys.net/plesk9-integration-with-clamav/

THANKS!