outbox /ˈaʊtˌbɒks/ (also out-box)

• 1. 

  N-COUNT An outbox is a shallow container used in offices to put letters and documents in when they have been dealt with and are ready to be sent somewhere else. 待发箱 [美国英语]

• 2. 

  N-COUNT On a computer, your outbox is the part of your mailbox which stores e-mails that you have not yet sent. 发信信箱

  例：

  You'll get a dialogue box when exiting the program reminding you that there are still e-mails in your outbox.

  当你退出程序时，你将会收到一个对话箱提醒你在发信信箱中还有一些邮件。