United States Postal Service(redirected from US mail)
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|Noun||1.||United States Postal Service - an independent federal agency that provides mail processing and delivery service for individuals and businesses in the United States|
United States Postal Inspection Service, US Postal Inspection Service - the primary law enforcement arm of the United States Postal Service
independent agency - an agency of the United States government that is created by an act of Congress and is independent of the executive departments