也可以指定将来自特定发送者的邮件自动放到垃圾邮件文件夹中。
You could also specify that mail received from a specific sender be automatically sent to your Junk mail folder.
给自己省点力：把收件箱这3天以前的所有的邮件移动到一个积压邮件文件夹中。
Do yourself a favor: Select all the email in your inbox that's more than three days old, and move it into a Backlog folder.
若要了解如何使用辅助索引，请考虑当用户更改邮件在邮件文件夹中的显示方式时所发生的操作。
To understand how a secondary index is used, consider what occurs when a user changes the way messages are presented in a messaging folder.
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