by email and on email区别

by email 释义：

通过电子邮件

例句：

You can send faxes by email from your computer.

你可以通过计算机用电子邮件发送传真信件。

on email释义：

在电子邮件

例句：

Rely on email for most everything.

几乎一切事情都依赖email。