Email service: Subscribes to notifications with an email topic, and when it receives a notification message it sends it via email.

电子邮件服务：订阅具有一个电子邮件主题的通知，当该服务接收到一条通知消息时，它通过电子邮件发送该消息。

youdao

Write him an email to suggest a specific topic with your reasons, and tell him about your arrangements.

给他写一封电子邮件，提出一个具体的话题并说明你的理由，然后把你的安排告诉他。

youdao

It will have a topic indicating it's an email notification.

它包含一个主题，表明它是一个电子邮件通知。

youdao

We look at what emails you reply to if you reply in theory that suggests this user must care about whoever sent this email or the topic they are in.

我们看看哪些邮件要回复,如果你回复了,理论上来说这表明了用户一定很关心,发件人以及邮件的主题。

哈佛公开课 - 计算机科学课程节选

AllThingsD added that the topic originated with an email from a reporter, who shared that they had switched to a 7-inch Samsung tablet from the iPad, because they found the smaller size of the Tab more appealing.

ENGADGET: Apple SVP Eddy Cue wanted 7-inch iPad in 2011, internal email says

The same topic was brought to my attention again recently in an email Kiki Peppard sent me.

FORBES: How Maternal Profiling is Hurting Women

Communications Tools: ever-growing email messages that must get categorized, organized and filed into various topic folders by each individual user.

FORBES: Enterprise 2.0: Why All Business Software Must Go Social