郵便箱
Noun
1
noun (common) (futsuumeishi)
mailbox (for delivered mail);letter box
はがきにこの切手を貼って郵便箱に投函しなさい。
Put this stamp on the postcard and drop it in the mailbox.
2
noun (common) (futsuumeishi)
mailbox (for outgoing mail);postbox