Open Outlook
Go to Sent Items
Double-click the email you want to recall
In 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 Tell me if recall succeeds or fails for each recipient if needed
Click OK
Wait for the recall results notification
Use recall only if the recipient is in the same Microsoft 365 or Exchange organization
Use recall only if the recipient has not already opened the email