Antispam basic settings
On the main page, it is possible to set the scan sensitivity as Low, Medium or High. avast! will perform a heuristic analysis of all incoming mail to identify potential spam – the heuristic analysis comprises a large number of tests based on typical spam content or behavior and the sensitivity level will determine how many tests would have to be failed for a message to be considered spam. The higher the sensitivity, the higher the “pass mark”, therefore the higher the number of emails that will fail the heuristic test and will be treated as spam.
If you find that a lot of “clean” messages are being sent to your spam folder, this may be resolved by reducing the heuristic sensitivity.