Open Outlook and go to the Sent Items folder
Double-click the email you want to recall to open it
Select the Message tab
Click 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 for each recipient
Click OK
If replacing the message, make your changes and send the updated email
Note that recall works only in certain Microsoft 365 or Exchange accounts
Note that recall usually works only if the recipient has not read the email and is using Outlook in the same organization