The Washington Declaration of Mailing is an agreement created by the states of Washington and Oregon to regulate the rules of mailing in the two states. It is a legally binding agreement that sets the guidelines for the delivery of mail from Washington to Oregon, and vice versa. The Washington Declaration of Mailing outlines the procedures for the handling and delivery of mail, including the types of mail items that can be sent, the fees associated with mailing, and the services available to customers. Additionally, the declaration also establishes the methods that must be used for the delivery of mail, such as the use of post offices, mail carriers, and other delivery services. There are two types of Washington Declaration of Mailing: the Standard Declaration of Mailing and the Enhanced Declaration of Mailing. The Standard Declaration of Mailing sets the basic requirements for the delivery of mail between Washington and Oregon. The Enhanced Declaration of Mailing includes additional requirements, such as the use of advanced tracking systems and specialized delivery services.