Any user who sets himself to receive a notification for a particular event will receive a notification. Notifications are set up on the "Maintenance Notifications" page under the Resource Info menu. (See image below for the full path.)
To add a notification, click on the 'Add' link. Or, click the 'Edit' link to edit an existing notification. This screen will allow you to add notifications for schedule maintenance events and/or squawk events. Hold the 'Ctrl' key to select multiple resources or events.