Minimum $ purchase for Product/Category Follow-up Email
It would be useful for Product/Category Follow Up emails to only be sent to customers who has purchased a particular product and made a minimum dollar amount purchase. This will avoid a never-ending cycle of emails (and coupon codes) being sent to a paying customer.
EX: Whenever someone purchases a product from me I want to automatically send them an email with a coupon code coax them to purchase another of the same product at a cheaper price. However this means that the customer will receive another coupon code every single time they use a coupon code. It becomes a never-ending cycle. The only way to break that is to also require a minimum purchase amount for the email to be triggered.