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United States. United States Postal Service (USPS) is an independent federal agency that provides postal services, such as mail forwarding, to the public. [6] [7] When using a private forwarder to forward mail, USPS form 1583 is required. Private mail forwarding services are also offered by private forwarding companies, who often offer features ...

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 ...

A ZIP Code's address and the city name written on the same line do not necessarily mean that address is within the boundaries of that city. The reason is that the USPS establishes ZIP Codes to maximize the efficiency of its system, not to recognize jurisdictional boundaries. The Postal Service designates one preferred place name for each ZIP Code.