What Is a Postmark on a Letter?


Quick Answer

A postmark is an imprint in black ink on the side of the letter that has the address written on it. Postmarks are applied by a local branch of the United States Postal Service. The postmark shows the date and the location of the local branch that accepted the letter.

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What Is a Postmark on a Letter?
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Full Answer

Postmarks have been added to letters by the United States Postal Service since the Postal Operations Manual was addressed in 1979 for First Class Mail letters and packages. The postmark appears on all letters and packages at lobby drop boxes, retail counters, collection boxes, and carrier pick-up residences or businesses. There are multiple methods for adding a postmark, including a manual hand-stamping device, automated system and older mechanized devices.

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