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

The Domestic Mail Manual (DMM) is the authoritative source that establishes the policies, regulations, and procedures governing domestic mail services. It provides comprehensive guidelines for the mailing process, including standards for mail classes, postage rates, and mailing practices. The DMM is essential for ensuring that mail services are consistent and compliant with federal regulations, thus helping businesses and individuals understand how to effectively send and receive mail within the domestic postal system.

In contrast, the Postal Service Handbook may contain useful information but does not specifically focus on the regulations and procedures for domestic mail services. Similarly, the Office Procedures Manual and the International Mail Manual pertain to different aspects of postal operations, such as internal office processes and international mailing standards, respectively. This distinction confirms why the Domestic Mail Manual is the correct choice for understanding the rules governing domestic mail services.