This arcticle desribes how we can implement custom mail filtering in a plesk9 server having postfix as the MTA. This can be used for mailfiltering tasks like moving over spam messages to a spam or .Spam folder at delivery time etc.This is only a single use that i have described here..but you can devise do [...]

Officially Plesk 9 does not support  ClamAV (Parallels as of the time of writing officially supports two antivirus solutions that needs you to pay for the license )
The integration uses Plesk9- Postfix - ClamSMTP - clamAV to get things working.This was accomplished in a CentOS -5.2 system .But it should work just fine on other [...]