
The notification templates in this folder are applied here: [Autotask menu] > Admin > Activations > Email Notifications & Surveys > Email Notifications > Incoming Email Processing. There is no tab on the Notification Templates page.

Refer to: https://www.autotask.net/help/Content/4_Admin/3Automation/EmailSurvey/EMAILS/IncomingEmailProcessing/ConfigureCustomMailbox.htm