debian + f-prot + qmail greylisted help

[masterkain]

hi everyone.

I've a debian stable with plesk 7.5.4, patched qmail to allow use of greylisting.

I would like to install an antivirus software that works with smtp, any advice or hint?

it is safe to go with this?
keep in mind that I'm on debian..
http://www.f-prot.com/support/unix/unix_manpages/f-prot-qmail.8.html

thanks.