Yes, the Standard Shield (configured with the proper extension files) and, in the Professional version of avast!, the Script Blocker.
Sorry, but I’m not sure at all of the extensions you may list for scanning ‘emails’. Anyway, I cannot imagine why you couldn’t configure your email client and avast! to work properly… A lot of users did it! avast! must have the same port setting as your email client (if you do not use a spam killer or other 3rd party application).