In certain circumstances, you can unsend a message. This makes the message disappear from the Mailbox or conference 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 her Mailbox. 
To unsend a selected or open message, choose Message > Unsend. An unsent flag is displayed beside the message in your Mailbox.  |