How to Digitally Sign or Encrypt Em…
https://www.howtogeek.com/665438/how-to-digitally-sign-or-encrypt-emails-in-outlook-online/
Enabling Encryption in Outlook Web App Log in to Outlook Online or Outlook Web Access (OWA). Open a new email. Click the three dots in the taskbar to open a drop-down menu, then select "Show Message Options." In the "Message Options" panel that opens, choose whether you want to sign or encrypt (or both) your message. Click the "OK" button. Click "Save" to save the changes. When composing an email, click on the Encrypt icon at the top of the email window to send an encrypted email. Log in to OWA and click the gear icon in the upper right corner. Select “Options” from the drop-down menu. Click on “Message Format” in the left-hand menu.
Log in to Outlook Online or Outlook Web Access (OWA).
Open a new email.
Click the three dots in the taskbar to open a drop-down menu, then select "Show Message Options."
In the "Message Options" panel that opens, choose whether you want to sign or encrypt (or both) your message.
Click the "OK" button.
Click "Save" to save the changes.
When composing an email, click on the Encrypt icon at the top of the email window to send an encrypted email.
Log in to OWA and click the gear icon in the upper right corner.
Select “Options” from the drop-down menu.
Click on “Message Format” in the left-hand menu.
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