system
11
you can customise & remove any providers that are of no use to you…go to add/remove programs…avast…change program…
by default there should be an email scanner icon in the system tray when downloading mails…you can try to open your resident scanner (system tray)…try to go to the mail provider and see whether there’s any mail attachments being scanned…maybe you can also go to customise and add a note into scanned clean message for your assurance…
when there’s a virus being found…avast will inform you with a popup alert…asking you to delete/move virus to chest…
it does take some time to appreciate how good avast! is… 
finally…i forgot to welcome you to this great avast community