The Qmail virus scanner (QScan) is a mail filter for Qmail that scans
incoming messages using the Sophos Antivirus engine, immediately rejecting
infected content.
Security
qscan needs read and write access to the /var/qmail/qscan directory.
ripmime needs only write access to the /var/qmail/qscan directory.
sweep needs only read access to the /var/qmail/qscan directory.
ripmime and sweep can be chroot()ed and/or systraced.