[gentoo-user] clamav and spamassassin

[Grant]

I haven't set up any antivirus measures on my Gentoo systems so I
think I should.  Is clamav run as a scheduled filesystem scanner on
each system and as an email scanner on the mail server all that's
necessary?

I'm currently greylisting email to prevent spam from getting through.
It catches a lot, but more and more gets through.  I'm not using any
mailfilters now and If I set up a clamav mailfilter I think I may as
well set up a spamassassin mailfilter to take the place of
greylisting.  Is this the best guide for clamav and spamassassin:

http://www.gentoo.org/doc/en/mailfilter-guide.xml

Could I run into any problems with clamav or spamassassin that might
make we wish I hadn't implemented them?

- Grant