From Administration > Email Notification > Tasks > Default Distribution, you can adjust the default Email Distribution lists for task-related events. These events include Task Add, Task Assign, Task Available, Task Complete and Task Cancel. Email distribution for standard user roles is determined by the values contained in the Default Email Notification List.
Issuetrak supplies initial default values for these task-related user roles. However, these values may be changed according to your needs. Be advised that these default values determine email notification for standard user roles on every Issuetrak Issue.