电子函件的英文：
E-mail

参考例句：

One important application for Internet is communication between computer users by the electronic mail, or email
因特网的一个重要应用是计算机用户间利用电子函件相互通信。

Email allows users to electronically transmit and receive messages, text, or data.
电子函件使用户可以用电子手段传递和接收消息、文本和数据。

mail是什么意思：
n. 邮政，邮递；邮件；盔甲
v. 邮寄；给…穿盔甲

Send the memo by express mail.
把这份备忘录用快递寄出。

mail and luggage van
邮政行李车

This parcel came in the mail today.
这个包裹是今天邮来的。

Cn you please confirm that you have received this mail.
您能否确认已收到此邮件

The mail was delivered late today.
今天邮件送得迟了。