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.