The U.S. Postal Service's new postmark process could lead to late fees and penalties when mailing time-sensitive documents.

Changes at the U.S. Postal Service are forcing people who rely on postmarks when voting, filing taxes or mailing legal documents to be extra careful when cutting it close to deadlines. Postmarks ...

For decades, a USPS postmark has served as official evidence that mail was sent on time. In elections, many state laws treat ...