Trivially solved by a postalesque method. Simply write delivery into the contract, and require fees paid to the registrar from any party sending mail through t

Trivially solved by a postalesque method. Simply write delivery into the contract, and require fees paid to the registrar from any party sending mail through the service (i.e. stamps). Critically, if one were going to do this, allow the domain owner to black hole all communication via this path if they're not interested.