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The United States Postal Inspection Service ( USPIS ), or the Postal Inspectors, is the federal law enforcement arm of the United States Postal Service. It supports and protects the U.S. Postal Service, its employees, infrastructure, and customers by enforcing the laws that defend the nation's mail system from illegal or dangerous use.

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 system executive. Postmaster General. The United States Post Office Department ( USPOD; also known as the Post Office or U.S. Mail) was the predecessor of the United States Postal Service, established in 1792. From 1872 to 1971, it was officially in the form of a Cabinet department. It was headed by the postmaster general .

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 ...