(chiefly, North America) (countable) A piece of mail, that is, an item of (physical) mail; especially, an item of flat envelope form factor as contrasted with an item of package form factor.
(chiefly, North America) (countable) A piece of mail, that is, an item of (physical) mail; especially, an item of flat envelope form factor as contrasted with an item of package form factor.
You have 0 mailpiece(s) and 1 inbound package(s) arriving soon. [U.S. Postal Service Informed Delivery email of the 2020s]
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(chiefly, US) A box into which mail is placed.
(usually, with "the", US) The mail delivery system.
(US) An investigative technique in which the United States Postal Service, acting at the request of a law enforcement agency, records information from the outside of letters and parcels before they are delivered and sends that information to the requesting agency.
(US) First class mail that provides the sender a proof of mailing and a delivery receipt.
(North America) Someone who delivers mail to, and/or collects mail from, residential or commercial addresses, or from public mailboxes.