Mass mail couldn't be any easier. You don't need addresses to do it at all. You just drop off stacks of mail at the post office, each carrier takes a whole stac

Mass mail couldn't be any easier. You don't need addresses to do it at all. You just drop off stacks of mail at the post office, each carrier takes a whole stack, and it's delivered to every mailbox on selected routes. It's called Every Door Direct Mail, a USPS service. Mailers pay by how many addresses are in a carrier's route. https://www.usps.com/business/every-door-direct-mail.htm https://www.usps.com/business/every-door-direct-mail.htm