(chieflyN. Amer.)the sender of a letter or package by post (主北美)寄信人;发件人 ■a person employed to dispatch newspapers or periodicals by post 报刊递送人 ■a free advertising pamphlet, brochure, or catalogue sent out by post 邮递广告;邮递宣传品 ■a container used for conveying items by post 邮件运送箱
(Computing)a program that sends electronic mail messages (计算机)电子邮件发送程序