also: ふみばこ
noun
letter box; document box
A box for storing letters and papers, often used in traditional or historical contexts.
祖母の文箱から古い手紙が出てきた。
Old letters came out of my grandmother's letter box.
noun
letter-carrying box; mail delivery box
A box used to carry or deliver letters, such as a postman's mail box or a courier's container.
昔の飛脚は文箱を肩にかけて手紙を届けた。
Old-time couriers delivered letters with a letter box slung over their shoulder.
Rare variant using 筥, an older character for a box or basket.
Compound of 文 (ふみ/ふ, 'letter, writing') and 箱 (はこ, 'box'). The reading ふばこ is a contraction of ふみばこ.