Which manual sets forth the policies, regulations, and procedures governing domestic mail?

The Domestic Mail Manual (DMM) is the authoritative source that outlines the policies, regulations, and procedures related to domestic mail handling and services. It serves as a comprehensive guide for postal employees and stakeholders to ensure compliance with standards governing domestic mailing practices. The DMM includes crucial information on mailing processes, rates, and the various categories of domestic mail, ensuring that all employees have access to the necessary guidelines for efficient service delivery.

In contrast, the International Mail Manual (IMM) focuses exclusively on regulations and procedures for international mail, which does not pertain to domestic mail practices. The Administrative and Support Manual (ASM) provides general administrative practices within the USPS but does not cover specific mailing regulations. The Postal Manual (PM) includes broader postal policies but is not exclusively dedicated to domestic mail regulations. Each of these manuals serves different functions, but the DMM is specifically designed for domestic mail and its complex regulations.