Send email alert to customers to return to a saved project

Hi - it would be great if there could be and email notification that could go to customers who have left a saved project in their account. We have a few customers who do not return to their saved project within the time frame and the session gets purged and they leave their project. It would be great if there could be an auto notification sent out to inactive projects to alert to customers so they could manage/adjust before the session gets purged.