They say that electronic mail is often informal, and so many people do not use proper spelling or grammar.

VOA: standard.2010.01.16

Now, there are no electrons so there can be no electronic mail.

现在，它没有电子,所以就不会有电子邮件了。

麻省理工公开课 - 固态化学导论课程节选

That file was electronic message, so suddenly in about 1971, we had e-mail. So an e-mail was pretty much the major use of the internet for the next 20 years.

那种文件就是电子消息，如此突然的，约在,1971年，我们有了电子邮件，电子邮件,基本上是此后20年互联网的主要运用形式。

麻省理工公开课 - 媒体、教育、市场课程节选