Open Outlook and go to the Sent Items folder
Find the email you want to delete
Select the email
Click Delete or press the Delete key
Empty the Deleted Items folder if you want to remove it permanently
If the email was sent from a shared mailbox or another account, make sure you are in the correct Sent Items folder
If the email is still in the Outbox, delete it there before it is sent
If you want to try recalling a sent email, open the message in Sent Items and use Recall This Message if available