再者，标题要抓住重点，让电子邮件主题行空白就是浪费收件人的时间。
Again, make it "to the point". Leaving email subject lines blank wastes the recipient's time.
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。
Email service: Subscribes to notifications with an email topic, and when it receives a notification message it sends it via email.
输入适当的电子邮件信息，如主题、收件人、发件人等。
Enter the appropriate E-mail information, such as Subject, To, From, and so on.
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