the area of a computer’s memory where email messages are stored 电子邮箱，信箱区（计算机的电邮存储区） - (North American English) (British English letter box)
a small box near the main door of a building or by the road, which mail is delivered to （建筑物大门口或路旁的）信箱 
- (North American English) (British English postbox, letter box)
a public box, for example in the street, that you put letters into when you send them 邮筒；邮箱 
