The United States 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, including its insular areas and associated states. It is one of the few government agencies explicitly authorized by the United States Constitution. The USPS, as of 2021, has 516,636 career employees and 136,531 non-career employees.
A ZIP Code is a postal code used by the United States Postal Service (USPS). Introduced in 1963, the basic format consisted of five digits. In 1983, an extended ZIP+4 code was introduced; it included the five digits of the ZIP Code, followed by a hyphen and four digits that designated a more specific location.
Canada Post Corporation, trading as Canada Post, is a Crown corporation which functions as the primary postal operator in Canada. Originally known as Royal Mail Canada, rebranding was done to the "Canada Post" name in the late 1960s, even though it had not yet been separated from the government. On October 16, 1981, the Canada Post Corporation Act came into effect. This abolished the Post Office Department and created the present-day Crown corporation which provides postal service. The act aimed to set a new direction for the postal service by ensuring the postal service's financial security and independence.
Dead letter mail or undeliverable mail is mail that cannot be delivered to the addressee or returned to the sender. This is usually due to lack of compliance with postal regulations, an incomplete address and return address, or the inability to forward the mail when both correspondents move before the letter can be delivered. Largely based on the British model that emerged in the late eighteenth century, many countries developed similar systems for processing undeliverable mail.
Yahoo! Mail is an email service launched on October 8, 1997, by the American company Yahoo, Inc. It offers four different email plans: three for personal use and another for businesses. As of January 2020, Yahoo! Mail has 225 million users.
In a postal system, a delivery point 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 are often called multiple-dwelling units (MDUs) by the USPS.
A post office box is a uniquely addressable lockable box located on the premises of a post office station.
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. A CMRA may also be known as a mail drop.
The Coding Accuracy Support System (CASS) enables the United States Postal Service (USPS) to evaluate the accuracy of software that corrects and matches street addresses. CASS certification is offered to all mailers, service bureaus, and software vendors that would like the USPS to evaluate the quality of their address-matching software and improve the accuracy of their ZIP+4, carrier route, and five-digit coding.
Freepost is a postal service provided by various postal administrations, whereby a person sends mail without affixing postage, and the recipient pays the postage when collecting the mail. Freepost differs from self-addressed stamped envelopes, courtesy reply mail, and metered reply mail in that the recipient of the freepost pays only for those items that are actually received, rather than for all that are distributed. Freepost of preprinted cards issued by businesses is also different from postal stationery sold by postal administrations.
Post offices and other mail service providers typically offer a mail forwarding service, commonly known as hybrid mail or virtual post office box services, to redirect mail addressed to one location to another address – usually for a given period. In the case of the United States Postal Service's First Class Mail, it is generally for a period of one year. British Royal Mail provides a service called Mail Redirection, enabling redirection for up to two years. Customers of such a service usually, but not exclusively, use mail forwarding when they change an address.
A Digital Postmark (DPM) is a technology that applies a trusted time stamps issued by a postal operator to an electronic document, validates electronic signatures, and stores and archives all non-repudiation data needed to support a potential court challenge - it guarantees the certainty of date and time of the postmarking. This global standard was renamed the Electronic Postal Certification Mark (EPCM) in 2007 shortly after a new iteration of the technology was developed by Microsoft and Poste Italiane. The key addition to the traditional postmarking technology was integrity of the electronically postmarked item, meaning any kind of falsification and tampering will be easily and definitely detected. Additionally, content confidentiality is guaranteed since document certification is carried out without access or reading by the postal operator. The EPCM will eventually be available through the UPU to all international postal operators in the 191 member countries willing to be compliant with this standard, thus granting interoperability in certified communications between postal operators. In the United States, the US Postal Service operates a non-global standard called the Electronic Postmark, although it is soon expected to provide services utilizing the EPCM.
The Post Office Box Lobby Recycling program is a project of the United States Postal Service (USPS) that was created on October 28, 2008, for mail customers to recycle paper items, using recycling bins placed in the customer lobbies of post office buildings. Some of the goals of the program are to reduce the amount of paper waste going to landfills, which helps to reduce the consumption of fiber from trees used for paper production and greenhouse gas emissions associated with waste disposal. USPS receives revenue from selling the material, and no tax dollars are used to fund the project. USPS was reported as having recycled over 200,000 short tons of waste in 2009, including paper, plastics and other waste.
A Nixie is a name given by the United States Postal Service to a piece of mail which is undeliverable as addressed. It is derived from "nix", English slang for the German nichts ("nothing"), and "-ie", an item or a thing.
Surface mail, also known as sea mail, is mail that is transported by land and sea, rather than by air, as in airmail. Surface mail is significantly less expensive but slower than airmail, and thus is preferred for large or heavy, non-urgent items and is primarily used for sending packages, not letters.
Postal address verification 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 if it is CASS-certified, meaning that it exists within the comprehensive list of mailable addresses in their Address Management System. This is different from the credit card Address Verification System (AVS), which is the method used by credit card processors to authenticate ownership of a credit card by verifying that the account on the credit card matches the billing address on file. Credit card AVS does not determine deliverability of an address.
Tritek Technologies, Inc. was founded in 1984 by inventor and innovator James Malatesta. Headquartered in Wilmington, Delaware, USA, Tritek specializes in custom designed hardware and software for mail processing equipment, imaging, and vote-by-mail. Tritek has many patents in mail sorting and processing.
Return Mail Inc. v. United States Postal Service, No. 17–1594, 587 U.S. ___ (2019), was a case before the United States Supreme Court dealing with whether a government agency can act as a "person" to challenge a patent within the 2011 Leahy-Smith America Invents Act that reformed the patent process within the United States. The Supreme Court, in a 6–3 decision, ruled that within context of Leahy-Smith, the government does not constitute a "person".
Semaphore Corporation was a company notable for being the first to provide public access to selected U.S. Postal Service databases, and for its early computer publications in the 1980s.
