next-day delivery guaranteed for shipments between major U.S. cities, available from the U.S. Postal Service for letters or packages of up to 70 pounds. Postage costs vary by weight, distance, and specific type of Express Mail used.
expedited mail delivery service offered by the U.S. Postal Service that, except for international mail, guarantees the delivery time of mail. There are five different types of Express Mail service, including same day airport service, custom designed service, next day service, second day service, and military service. Express Mail International service is available between the United States and most foreign countries. Express Mail is a USPS trademark. The cost of Express Mail is competitive with other overnight mail delivery services, such as Federal Express, but is not available to all U.S. addresses. The fee varies by service type and piece weight. Size and weight limits apply.
