OK, let's start over.
I'm running Free BSD 5.2.1 with sendmail. Before vanishing into the night (i.e. resigning) the previous admin wrote the following flow chart:
sendmail-rx --> amavisd --> sendmail-tx
That's how he wrote it. He explained that the sendmail-rx receives mail from outside and also outgoing user email, passes it through the spam and virus filter and then the sendmail-tx either sends the mail out to the world or dumps it in the users inbox depending on where it was originally headed.
All I really want to do at the moment is tweak the spamassassin configuration as one very important user is complaining about getting massive spam.
I suspect the spam filter isn't even on at the moment. Any help troubleshooting this would be appreciated.