Open Outlook and go to the Sent Items folder
Double-click the email you want to recall
Select File
Select Info
Select Resend or Recall
Select 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 it and send the updated email
Make sure both you and the recipient use Microsoft Exchange or Microsoft 365 in the same organization
Recall only works if the recipient has not opened the message
Recall may not work for external recipients or in some Outlook apps