For that, Open the new Outlook app and start composing a new email. Then, switch to the Options tab and find the lock or Encrypt option. Click on it and select the Do Not Forward option.

Choose Not Junk An email will automatically be sent to improve the the spam filters going forward. If you are not using Outlook, you can encrypt an outgoing message by typing [secure] anywhere in the ...

or the recipient will see it This article explains how to recall an email, the requirements for recalling Outlook emails, and potential results and delays that can occur during the process.