Etymology
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mailbox (n.)

also mail-box, 1797, "box for mailbags on a coach," from mail (n.1) + box (n.1). Meaning "letterbox, box placed in some public place for the deposit of letters to be gathered by the postman," is by 1853, American English.

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Definitions of mailbox

mailbox (n.)
a private box for delivery of mail;
Synonyms: letter box
mailbox (n.)
public box for deposit of mail;
Synonyms: postbox / letter box
From wordnet.princeton.edu