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Postmarking Myths and Facts - Statements - About. usps. com MYTH: The Postal Service has long offered the postmark as a way of proving when mail was sent FACT: Customers have used postmarking for their own purposes, but postmarking is not and has not been a service that the Postal Service has provided to the public for such purposes
New USPS Postmark Rules Could Affect if Your Tax Filing Is Considered . . . To protect yourself, file or pay electronically when possible, or if mailing near a deadline, go to a post office counter and obtain a dated postmark and proof of mailing The USPS adopted new rules governing postmarks, effective December 24, 2025
Postmarked Mail vs. Dated Postage Stamp - VPM Help When mail is postmarked, the mail is stamped with an imprint (usually in black ink) on the address side of your envelope The postmark will show the location and the date the envelope was accepted at the post office:
USPS Postmark Rules Change: What You Need to Know - AARP Request a manual postmark (also called a local postmark) to ensure the date matches when your item was accepted Send by registered or certified mail, methods that provide mailing receipts and tracking