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post office - government department handling mail service; local branch of this department through which mail is processed; building housing local branch
post office box - PO box; numbered box at post office used as address for receipt of mail
railway express - system for shipment of packages by railroad
registered mail - mail recorded in originating post office and at successive points of transmission for guarantee of special handling and safe delivery
return to sender - postal designation indicating recipient is no longer at address and no forwarding address is known