Open Outlook
Go to the Sent Items folder
Open the email you want to pull back
Select File
Choose Info
Click Resend or Recall
Select Recall This Message
Choose Delete unread copies of this message or Delete unread copies and replace with a new message
Check Tell me if recall succeeds or fails for each recipient if needed
Click OK
Note that recall only works in some Microsoft Exchange or Microsoft 365 accounts
Note that recall usually only works if the recipient has not opened the email
Note that recall may not work for recipients using other email clients or outside your organization