郵便箱 can refer to either a private mailbox for receiving mail or a public red postbox for sending mail. In everyday speech, 郵便受け is more common for a home receiving box, while ポスト is widely used for both types.
Common collocations
- 郵便箱を開ける — to open the mailbox
- 郵便箱に投函する — to drop into the mailbox
- 郵便箱がいっぱいだ — the mailbox is full
Similar words
- ポスト — mailbox; postbox (loanword, very common in daily conversation)
- 郵便受け — mail slot; receiving mailbox (specifically for receiving)
- 私書箱 — post office box (PO box, rented at a post office)