Recalling an email2 message is as simple as selecting the message in your sent items, and clicking "Recall."
You will be given the opportunity to enter a reason for the message recall. This will be displayed to all users that attempt to access the recalled message. If you do not enter a reason, default text will be displayed.
Recalling a message prevents recipients from viewing the content, replying to it, or forwarding it, even if they have already retrieved it! The message will be revoked the next time they try to access it. In addition, all attachments and video messages will be deleted from the server.