@ Chim
If you use the AOHell email client the Internet Mail provider won't cover it because it doesn't use the standards for pop3 and smtp mail protocols, but its own proprietary spit protocol, they really make life difficult for their users as I continue to mention.
You would also have to manually configure any non AOHell email client to use the avast Internet Mail proxy (the same problem as with the web shield because of your OS) or run the Mail Protection Wizard. I don't know how or if this might work if your email server is at AOHell, I just don't know.