So the use case here is a user wants to get an email notification for a Collection they've created. If any pages in the collection are updated, they want a notification.
I'd like to have it so that the user can just check a box in the Collection criteria interface.
First off, are there any existing add-ons that do this or similar?
If not, can anyone tell me what other add-ons would be necessary in order to achieve this functionality (given that I'd have to write an add-on on top of whatever I'd be installing)?