Sendmail
Because the milter is connected to sendmail, you need to configure
and modify sendmail correctly to work with this milter. Naturally we
always recommend that you run the latest version of sendmail,
available from
sendmail.org.
If you have never installed sendmail before, you certainly should
buy the O'Reilly
sendmail
book, 3rd edition.
If you are unsure if you should run V8.12 or V8.13 read our discussion
of the differences in versions before you decide.