Answer: A CANCELLED email is sent as soon as some alert criteria is changed or disabled using the Alerts Criteria Page. At that point the alert testing process "starts over"; it doesn't matter what the change is. For example, even if the new alert condition is already met when the change is made, if there is a waiting period it is honored before a new alert is issued.

The "Recent alert history" section of a CANCELLED email is a list of recent ALERT, ALL CLEAR and CANCELLED conditions for this target database.

The Foxhound Options - Email Settings page lets you specify general email settings.

See also...
Foxhound Options - Email Settings
Alerts Criteria Page
ALERT ...
ALL CLEAR ...