For decades, a USPS postmark has served as official evidence that mail was sent on time. In elections, many state laws treat a ballot as valid if it is postmarked by Election Day, even if it arrives ...

The USPS’s mail processing rule affects people who are sending things on tight deadlines, such as tax returns or mail-in ...

A new rule published by the United States Postal Service is encouraging people to get important mail sent out early.

Here's what to know about 2026 Postal Service changes in postmark process, postage stamps and USPS shipping rates ...