What does DMM stand for in postal terminology?

DMM stands for Domestic Mail Manual. This is a comprehensive guide published by the United States Postal Service that outlines the standards, regulations, and procedures for various domestic mail services. The Domestic Mail Manual provides critical information that postal employees and customers need to understand how to properly prepare, send, and handle domestic mail. This includes guidelines on mailing options, pricing, formats, and addressing, which are vital for ensuring smooth postal operations and compliance with USPS regulations. The DMM serves as a valuable resource for those working within the postal system, helping to facilitate efficient and effective mail services across the country.