Plural of mailbox; containers where mail is delivered and stored, usually found outside homes or in public locations.
A compound word from 'mail' (correspondence) + 'box' (container). The mailbox as we know it became common in the early 1900s with standardized postal service expansion.
The iconic American rural mailbox is so culturally specific that other countries were confused by it—and artists like Robert Smithson used them in art installations about American identity!
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