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A postman collecting mail for delivery. The mail or post is a system for physically transporting postcards, letters, and parcels. [ 1] A postal service can be private or public, though many governments place restrictions on private systems. Since the mid-19th century, national postal systems have generally been established as a government ...
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 ...
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 ...
Electronic mail ( email or e-mail) is a method of transmitting and receiving messages using electronic devices. It was conceived in the late–20th century as the digital version of, or counterpart to, mail (hence e- + mail ).
A postal code (also known locally in various English-speaking countries throughout the world as a postcode, post code, PIN or ZIP Code) is a series of letters or digits or both, sometimes including spaces or punctuation, included in a postal address for the purpose of sorting mail . As of August 2021, the Universal Postal Union lists 160 ...
A postmark[1]is a postal markingmade on an envelope, parcel, postcardor the like, indicating the place, date and time that the item was delivered into the care of a postal service, or sometimes indicating where and when received or in transit.
Post office. A post office is a public facility and a retailer that provides mail services, such as accepting letters and parcels, providing post office boxes, and selling postage stamps, packaging, and stationery. Post offices may offer additional services, which vary by country.
Registered mail is a postal service in many countries which allows the sender proof of mailing via a receipt and, upon request, electronic verification that an article was delivered or that a delivery attempt was made. Depending on the country, additional services may also be available, such as: