When such an email is received, Exim logs the error including various information related to the sender and email headers.

当这些电子邮件后，包括不同的错误日志进出口的相关资料发送者和电子邮件的标题。

youdao

If you don't know it, write him an email pretending to be a customer and look at his return headers.

如果不知道的话，可以假装是他的顾客发封邮件过去然后看回信的邮件头。

youdao

So the idea of this was to create a "server" that would work by reading my email and looking for certain key headers in the email.

所以这个想法是创建一个“服务器”，通过阅读我的电子邮件，并寻找电子邮件中的某些关键标题。

youdao

When that magic day comes, my incoming mail server will look at the headers of the incoming email.

FORBES: Authenticate This!