postbox/'pəʊstbɒks $ 'poʊstbɑːks/

n. a box in a public place where you put letters you want to send

n.〈英〉[C] 邮箱；邮筒：The last collection from this postbox is at 5 o'clock. 这个邮箱最后一次收集信的时间是5点钟。

构词post + box

用法美语用mailbox。