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In certain circumstances, you can unsend a message. This makes the message disappear from the container to which you sent it. 
  Note 
 
Be aware that the message may have already been read. 
You can't unsend a message that was: 
 
• sent through the Internet or a gateway 
• moved into a folder or deleted by the recipient 
• sent to a user who does not allow you to unsend from his Mailbox. 
 
To unsend a message, open it, then click Unsend. The message becomes editable, and an unsent flag is displayed beside the message in your Mailbox.  |   |