I love the idea of a 'do not junk mail' list as part of the payment fee. Anyone know of an api or form to submit someone's address to (with their consent of cou

I love the idea of a 'do not junk mail' list as part of the payment fee. Anyone know of an api or form to submit someone's address to (with their consent of course) in order to be added to a 'do not junk mail' list?