USPS, the official postal service in the USA. FedEx and UPS immediately compete with USPS Express Mail and package delivery couriers, doing nationwide deliveries of urgent letters and packages. Due to the USPS monopoly, other couriers in the USA are not allowed to deliver non-urgent letters and cannot ship to U.S. Mail boxes at residential and other business locations. Even so, the two competitors have transit agreements with the USPS in which an item can be dropped off with both FedEx or UPS who will then be in charge of the shipment to the final destination in which it will be transferred for delivery to the U.S. Mail location, which includes Post Office Box destinations. These couriers also provide packages delivery which are bigger and heavier than USPS will accept. DHL Express was the 3rd main USPS competitor right up until 2009, when the company decided to stop domestic delivery operations in the United States.