The Postal Bulletin is the correct source for official updates within the USPS, and it is published bi-weekly. This publication is an important tool for retail clerks and other USPS employees, as it provides vital information about new policies, procedures, and operational changes that impact the daily operations of the postal service. The bi-weekly frequency ensures that employees stay informed about current practices and any new developments in a timely manner.
In contrast, while the Postal Guide and the Postal Operations Manual are valuable resources, they serve different purposes. The Postal Guide is a comprehensive document that outlines postal services and rates, whereas the Postal Operations Manual details the operational policies and procedures of the USPS. The USPS Update provides ongoing information but is not specifically issued bi-weekly like the Postal Bulletin. Thus, the Postal Bulletin stands out as the primary source for timely official updates within the USPS framework.