A mail class that provides expedited delivery service. This is the fastest mail service offered by the USPS. Express Mail International Service is available between the United States and most other countries.
The Postal Service's premium delivery service, providing guaranteed overnight delivery for documents and packages weighing up to 70 pounds. Both domestic and international services are offered.
In most postal systems Express mail refers to an accelerated delivery service for which the customer pays a surcharge and receives faster delivery. Express mail is a service for domestic mail and is governed by a country's own Postal authority. Since 1998 the international accelerated delivery services are governed by the EMS Cooperative.