So I added SpamExperts to my account and it's set up and working for the last day. The problem I'm having is that some spammers are still pointing to my old MX records of SmarterMail and their email spam is bypassing SpamExperts. You can see this by looking in the spam email headers and you don't see the entries normally added by SpamExperts. Their knowledge base discusses this issue and points out how to look for this....
Limit email delivery in SmarterMail to only SpamExperts MX records