Is there a letter from them in the mail ?

邮件里有他们来的信吗？

《牛津词典》

Your cheque is in the mail.

你的支票在邮递途中。

《牛津词典》

"We all get papers like those in the mail," Greene said.

格林说：“我们都会收到像邮件里那样的文件。”

youdao

So,in eighteen fifty-seven, Congress offered to help any company that would try to deliver mail overland to the West Coast.

VOA: special.2010.04.26

If you own stock-- we don't get them in the mail anymore because you own it through some brokerage account and you get it on a website.

如果你有股票...,我们现在不通过挂号信了,因为人们都通过经纪人账户,在网站上购买股票

耶鲁公开课 - 金融市场课程节选

This gets back--People are accustomed to getting dividend checks in the mail.

回到这里,人们习惯于,通过挂号信取得股利支票

耶鲁公开课 - 金融市场课程节选

When I started getting college catalogues in the mail shortly thereafter, I knew who was responsible.

FORBES: Thanks, Dad.

People who call or e-mail but don't buy get letters in the mail, then phone calls.

FORBES: The 200 Best Small Companies

They may not get a voucher in the mail, but that is what it is.

WHITEHOUSE: Press Briefing