This method will guide you to recall the sent email in Outlook, edit it as you need, and then resend it. Please do as follows:

1. Open the Sent Items folder, and double click to open the specified sent email you will edit.

2. Now the sent email is opening in the Message window. Please click Message > Actions > Recall This Message. See screenshot:

3. In the popping Recall This Message dialog box, please check the Delete unread copies and replace with a new message option, and click the OK button.
Note: It’s optional to check the Tell me if recall succeeds or fails for each recipient option.

4. Now the sent message is editable. Please edit it as you need, and then click the Send button.

Note: The Recall This Message feature can recall emails only if recipients have not read this sent email yet.

Quickly search and delete duplicate emails in Outlook

With Kutools for Outlook’s Duplicate Emails feature, you can quickly find and delete them from multiple mail folders, or find and delete all duplicates from the selected ones with two clicks in Outlook.

Delete/recall a sent email before recipients reading in Outlook

Recall or retract a sent message in Outlook