If we want to selectively delete messages from a maildir format mail account the following python script comes handy
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http://svn.houseofnate.net/unix-tools/trunk/cleanup-maildir
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An example usage i had for deleting messages older than 7 days in the Spam folder is
dir=”/the/path/to/my/maildir”
cleanup-maildir –maildir-root=$dir –age=7 delete ‘Spam’

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 [...]