The popular Encrypt-Only policy for Office 365 Message Encryption can now be enabled automatically as part of a DLP (Data Loss Prevention) policy.
What is the Office 365 Encrypt-Only policy?
The Encrypt-only policy is useful because it encrypts the message and prevents it from being intercepted or scanned by other mail systems. To read the messages, recipients need to sign in via a Microsoft, Google, Yahoo or Office 365 account. If they don’t have any of those accounts, they can request a one time password to access and read the email.
It’s called Encrypt-only because other encryption options in Office 365 also enforce policies that prevent a message from being forwarded or printed. The Encrypt-Only policy just encrypts the message and prevents it from being accessed by anyone who shouldn’t.
Enabling Encrypt-Only via a DLP policy
If you are using Office 365 Message Encryption already, you can set up a DLP policy that will enable Encrypt-Only on email messages that match a certain DLP trigger. These policies are configurable in the Security and Compliance Center at https://protection.office.com.
Here is a policy that is set to trigger on emails containing Australian Financial Information:
The action for this policy is to apply the Encrypt-only message encryption policy:
This feature is available now for organisations with Microsoft 365 E3 and E5, Office 365 E3 and E5 or as part of the standalone Azure Information Protection SKUs.