The United States Post Office does not deliver mail on Labor Day. According to the USPS, Labor Day is one of its postal holidays. Employees get the day off, and mail service is not conducted on Labor Day, which is the first Monday in September.
Labor Day is one of 10 typical holidays recognized by the post office. New Year's Day, Memorial Day, Independence Day, Thanksgiving Day and Christmas Day are among the other nine holidays. Because the USPS does not deliver mail on Sunday either, residents and businesses do not receive mail after the Saturday of Labor Day weekend until the following Tuesday.