Postmarks and Postal Possession

USPS offers postmarking guidance – Organization shares myths and facts about postmarks

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February 3, 2026 The Postal Service has made resources available to employees and customers to clarify a recent addition to Domestic Mail Manual (DMM) section 608.11.0, Postmarks and Postal Possession, and to improve public understanding of postmarks and their relationship to the date of mailing. The new wording, which was officially added to the DMM on … Read more

USPS: Postmarking Myths and Facts

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January 2, 2026 MYTH: How the Postal Service applies postmarks is changing. FACT: The Postal Service has not changed and is not changing our postmarking practices, which have been consistent since we began moving away from hand-canceling every item at Post Offices decades ago. Postmarks are generally applied by machines at our originating processing facilities and … Read more