通知请求可以通过电子邮件、短消息服务或根据客户偏好指定的其他方式发送。
The notification request might be sent by e-mail, a short message service, or another method as indicated by the customer preferences.
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.
通过添加另一个通过电子邮件来发送标记消息的方法，也许是将其命名为disk_alert (self)，这样就可以进一步自定义新类。
You could further customize the new class by adding another method, perhaps called disk_alert (self), which would E-mail flagged messages.
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