A "reminder email" is a message sent to remind someone about a task, event, or deadline. It helps jog their memory and encourage them to take necessary action or be prepared. Full definition
Perhaps your purchase confirmation includes guidelines for maximizing the service, or maybe you automatically send reminder emails for any scheduled appointments. (entrepreneur.com)
With our online rent payments, it's easy for tenants to get set up, they can enroll in automatic rent payments, and receive reminder emails. (rentalutions.com)
To make things even easier, why not set up automated reminder emails when payments become overdue? (creativeboom.com)