The default task categories are General, Sales, Support and Project. If you want to customise the email notifications based on different categories, you can set the Conditions in the settings.  For example, Conditions: Category matches General. So the email notification will only send when the task category is General. Custom task categories feature is available for Level 2 subscription only. If you are having Level 1 subscription and wish to have this feature without upgrading your subscription, contact us for more information.