Open the Sent Items folder
Double-click the email message you want to recall
Go to the Message tab
Select Actions
Click Recall This Message
Choose Delete unread copies of this message or Delete unread copies and replace with a new message
Select whether to receive a recall success or failure notification
Click OK
If replacing the message, edit and resend the updated email
Note that recall works only in certain email systems and only if the recipient has not read the message