You can use the following methods to send an encrypted email.
Using The Encrypt Button
1. Choose New Email to start a new message.
2. Enter a name or email address in the To, Cc, or Bcc field.
3. In Subject, type the subject of the email message.
4. Click on the Options tab, then on the Encrypt button.
Tip
For easier, one click access to the Encrypt button, right click on the button and select Add to Quick Access Toolbar. The Encrypt button will then appear at the top of every new email window.
When encrypting an email message, there are two options for encryption:
Encrypt-Only allows you to send encrypted messages to any recipient, whether they are inside the organization or not. If the recipient is a Microsoft 365 customer and using Outlook, Outlook on the Web, or Outlook for mobile, they will be able to open the encrypted e-mail without any additional steps. If the recipient is not a Microsoft 365 customer, they will receive an e-mail with a link to the message, which is securely stored on Microsoft 365 servers. The recipient would then need to sign-in with their Microsoft or Google credentials, or choose to receive one-time access code to access the message. For more information on how to open a protected message, refer to this article from Microsoft: https://support.office.com/en-us/article/How-do-I-open-a-protected-message-1157a286-8ecc-4b1e-ac43-2a608fbf3098?ui=en-US&rs=en-US&ad=US.
Do Not Forward allows to you send an encrypted message, and also restricts the content and email from being forwarded, printed or copied. Be aware that with this option, the recipient could still take a screenshot or picture of the message using a camera.
Note
If when you click on the Encrypt button, you only see an option to Connect to Rights Management Servers and get templates, go ahead and click on that option. It will enable the Encrypt-Only and Do Not Forward options, causing them to appear.
5. Click Send to send the email message.
Using The Subject Line
You can also encrypt an email by including [Encrypt] at the beginning of the Subject line of an email. For example, an email with the following subject line would be encrypted:
