Is The Usps Open Today 2025. In observance of the national day of mourning for former president jimmy carter, the postal service will suspend regular mail delivery and retail service on thursday, january 9,. 9 as a national day of mourning to honor former president jimmy carter.

That means you’ll have to wait until the following day to buy stamps or ship large items. To find out if mail is arriving today, usps offers a free service called informed delivery.