The open-source ClamAV (Clam Anti-Virus) virus scanner can be invoked in a variety of ways. This document describes my experience in installing it as a sendmail milter from the FreeBSD ports. The setup I describe doesn't require the MIMEDefang (or other milter) wrapper.
FreeBSD's sendmail executable is compiled to support milters by default. There should be no need to recompile sendmail to support milters unless you are using a non-standard executable for some reason.
To verify that your sendmail supports MILTERS, issue the following command as root:
# sendmail -d0.1 -bt < /dev/null | grep MILTER
You should see a line of output that includes the word "MILTER".
Before you begin, make sure that your FreeBSD ports tree is up-to-date.
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