Stamp Cancellation

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August 25, 2024 3 min read Definitions
Postmark: The Proof of Mailing Date and Location
Postal Services Law Postmark USPS Mailing Evidence Stamp Cancellation Postage
Postmarks are cancellations affixed on stamps by the U.S. Postal Service to indicate the usage and validity of the postage, providing legal evidence of the mailing date and location.
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