Thanks, i finally found the wizard, although the option to change settings manually was faded out, the second option down was to remove the avast configuration, so I did that and checked to see if the Internet Mail system in Avast stopped, which it did and then I reactivated it by selecting the top option in mail wizard to automatically configure it again.
If you don't change any of the default settings, the Advanced tab of Heuristic settings will remain disabled, i.e., default values.
Oh, so disabled/default values means that the heurisitc-advance settings will still work if an email tried to send itself from the address book a certain amount of times within a few seconds ?