currently I do not think this is supported. While work item changes, builds and other artifact changes have a post trigger that supports email notification there is no trigger of process area changes that I am aware of.

You would have write custom code, weighing benefit against cost.

Another solution might be to create a custom work item type serving as representation of e.g. a release timeline / iteration. If your use case for notification is more about people knowing, have the folks creating timelines / iterations link them to such a work item and use the work item email notification. If your reason for notification is more to stop the proliferation of timelines / iterations, consider locking down the permissions to create and custom code the creation as a post work item save step for this special work item type. Bonus: you can put email notification as part of your custom code and resolve role to email list.

If this was helpful please mark the answer as accepted.

- Arne