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Postal Clause. Article I, Section 8, Clause 7 of the United States Constitution, known as the Postal Clause or the Postal Power, empowers Congress "To establish Post Offices and post Roads ." The Post Office has the constitutional authority to designate mail routes. The Post Office is also empowered to construct or designate post offices with ...
Dead letter office, probably in Washington, D.C.; September 1922. A dead letter office (DLO) is a facility within a postal system where undeliverable mail is processed. Mail is considered to be undeliverable when the address is invalid so it cannot be delivered to the addressee, and there is no return address so it cannot be returned to the sender.
Postal address verification (also known as address , address validation, address verification and CASS certification [1]) is the process used to check the validity and deliverability of a physical mailing address. According to the United States Postal Service, an address is valid (or mailable) if it is CASS-certified, meaning that it exists ...
The United States Postal Service ( USPS ), also known as the Post Office, U.S. Mail, or Postal Service, is an independent agency of the executive branch of the United States federal government responsible for providing postal service in the United States, its insular areas, and its associated states. It is one of the few government agencies ...
Learn about delivery delays. Messages are often delivered right way though very rarely there may be a delay in transit. This is usually due to problems on the mail server, heavy internet traffic, or routing problems. Unfortunately, other than waiting, you won't be able to determine if the message is delayed or undeliverable.
Delivery point. In a postal system, a delivery point (sometimes DP) is a single mailbox or other place at which mail is delivered. It differs from a street address, in that each address may have several delivery points, such as an apartment, office department, or other room. Such buildings (primarily residential) are often called multiple ...
A post office box (commonly abbreviated as P.O. box, or also known as a postal box) is a uniquely addressable lockable box located on the premises of a post office . In some regions, particularly in Africa, there is no door-to-door delivery of mail; for example, in Kenya. [citation needed] Consequently, renting a PO box has traditionally been ...
Commercial mail receiving agency. Within the United States, a commercial mail receiving agency ( CMRA) is a private business that accepts mail from the Postal Service on behalf of third parties. [1] A CMRA may also be colloquially known as a mail drop. [2] A mailbox at a CMRA is called a private mailbox (PMB). [1]