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USPS Postmark Guide

What USPS postmarks mean, when the date matters, and how to protect yourself for tax filings and legal deadlines.

ARTICLES

Comparison of automated USPS postmarks and hand cancels across who applies them, which date they show, whether the sender controls the date, and which to use for a deadline.

POSTMARK ·

How to Postmark a Letter: USPS Rules and Options

USPS postmark dates no longer match your drop-off date. Learn how to get a manual postmark for free, why it matters for deadlines, and your alternatives.