What is the official source of updates to policies and procedures for postal services?

The postal bulletin serves as the official source of updates to policies and procedures for postal services. This publication is specifically designed to communicate new developments, changes, and important information that postal employees need to stay informed about current practices and regulations. It provides timely and essential information directly related to the operations and standards followed within the postal system.

Other resources, such as the postal guide, retail handbook, and mail service manual, offer valuable information and guidelines, but they do not serve as the primary source for updates. The postal guide generally contains comprehensive information about mail services and regulations, while the retail handbook focuses on retail practices and procedures. The mail service manual encompasses operational guidelines specific to mail processing. However, none of these publications fulfill the role of the postal bulletin in providing the latest policy updates and procedural changes.