ドアポスト

noun

door-mounted mailbox; letterbox on the front door

A mailbox attached to or built into the front door of a house or apartment, common in Japan. Note that this is wasei-eigo; the English 'door post' does not carry this meaning.

wasei-eigo (Japanese-coined English), from door post

• 郵ゆう便びん屋やさんがドアポストに手て紙がみを入いれました。

  The mail carrier put a letter into the door-mounted mailbox.

• このマンションの各かく部屋へやにはドアポストが付ついています。

  Each room in this apartment building has a letterbox on the door.