From LQWiki
clamassassin is a shell script for filtering an email message through ClamAV, using either the command-line scanner clamscan or the client clamdscan. It adds message headers according to the disposition of the mail in a manner similar to Spamassassin, making it convenient to call through Procmail or Maildrop.
Sample procmailrc file
An /etc/procmailrc file passing mail through clamassassin followed by spamc.
DROPPRIVS=yes
:0 fw
| /usr/local/bin/clamassassin
:0:
* ^X-Virus-Status: Yes
$HOME/Virus
:0 fw
| /usr/local/bin/spamc -U /var/run/spamd.socket
:0:
* ^X-Spam-Status: Yes
$HOME/Spam

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