jscott you can see my reply over on page 2 of this thread
here. This mention of spam is something he brought up here recently. Should we have had an opportunity to see what happened, we might have been able to help. One point worth noting is he was using a 6 character password for his server that is a name like "mickey" or "donald". With a password like that his server would have surely had a problem at some point, though I still don't know specifically what happened in this case.