Stamped with an official mark showing the date and location when mail was processed at the post office.
Compound of 'post' (from Latin 'postis,' meaning position or placed) and 'marked.' The postmark system developed in the 1600s as mail became more common and needed tracking.
Before email, the postmark was your only proof that something was officially sent on a particular date—that's why in legal disputes people obsess over postmark dates, and why historical postmarks are treasure to collectors studying how mail routes evolved.
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