Oct 14, 2025
In the subject of your email insert the word [ENCRYPT] or [PRIVATE], followed by a space, and then your normal subject text.
See the example below:
Microsoft handles the decryption part automatically if the email is sent to another 365 user by verifying the recipient is who they say.
If sending to an external user, a code can be requested.
Ask the recipient to follow the instructions included with the email.
Questions about encryption? Contact the helpdesk at [email protected]