QClam

Homepage: http://sageshome.net/oss/qclam.php
Supports: clamscan
QClam is a simple program to plug ClamAV antivirus to your QMail mailbox. It runs from your  /.qmail file, receives incoming messages from QMail and scans them using clamscan; if a virus found, it returns 99 to QMail telling it that the message should not be processed (and it just gets removed). QClam also writes results of scanning into log file:  /qclam.