To prevent users from turning off or deleting a subscription to a notification, make the notification mandatory.

1. Navigate to System Notification > Email > Notifications.
2. Open the appropriate notification.
3. Configure the form and add the Mandatory field. This field does not display by default.
   1. Click the context menu icon () and select Configure > Form Layout.
   2. Using the slushbucket, select the Mandatory field and the order in which you want the field to appear.
   3. Click Save.
4. Select the Mandatory check box.

   When a user checks their notification preferences, the control button for the mandatory notification is on and is read only.