http://www.clamav.org/support/faq/

If you want remove clamav permanently from you system
execute following commands:

 # rm -rf /var/log/clamav
 # rm -rf /var/run/clamav
 # rm -rf /var/db/clamav
 # pw userdel clamav

 Reporting problems, asking questions:
 - FreeBSD specific port-related problems/questions/patches: maintainer
(and ports@ if you feel the need); send-pr only if you get no timely reply
 - dspam specific questions: dspam/dspam-dev mailing list (maintainer cc'ed)
 - dspam specific patches: dspam/dspam-dev mailing list (maintainer cc'ed)
 Please be sure to include in your email/pr relevant information such as:
 uname -a, dspam --version, /var/db/ports/dspam/options, MTA setup.

Asking about updates or telling me there is one: not only I am active on the
mailing lists and IRC but I also track dspam CVS so I already know; either there
is a problem with the new version or I didn't have enough time to patch the port
and _test_ the new version; please report your success/failure if you run the
new version or the cvs version.


 To enable the dspam deamon put dspam_enable="YES" in your
 /etc/rc.conf

 You'll find additional setup instructions under
 /usr/local/share/doc/dspam
and
 /usr/local/share/examples/dspam
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If you haven't defined NOPORTDOCS you can review this
message in /usr/local/share/doc/dspam/README.FreeBSD