Take any company, buy the domain mail-corportationname.com, and probably get any phone support person to believe you are in fact working for that corporation.

比如找准下手的目标公司之后，注册一个含有该公司名的域名如“mail-公司名.com”，说不定就能让客服人员相信你是那家公司的员工。

youdao

Choosing this option blocks all mail from this domain.

选择该选项会阻止来自该域的所有邮件。

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What about mail details or other mail domain objects?

那么邮件详情或其他邮件域对象呢？

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Two technologies are used in conjunction: DKIM (Domain Keys Identified Mail) and SPF (Sender Permitted From).

FORBES: Authenticate This!

The authorized account holder is defined as the natural person who is assigned to an e-mail address by an Internet access provider, online service provider, or other organization responsible for assigning e-mail addresses for the domain associated with the submitted e-mail address.

ENGADGET: blogger-avatar

Some use "mail relay, " borrowing someone else's domain to send e-mail.

FORBES: Spam Warfare