EDDM (Every Door Direct Mail) is a USPS program that lets you send postcards to every home and business on specific postal carrier routes without buying a mailing list. You pick the neighborhoods, design your postcard, and the postal service delivers it to every mailbox on those routes. Postage runs $0.26 per piece as of July 2026, making it one of the cheapest ways to get a physical marketing piece into someone's hands.