Question

Contoso wants to automatically apply a sensitivity label to email messages sent through Exchange Online whenever the message body contains credit card numbers, without requiring any user interaction and without depending on whether the user has the Purview Information Protection client installed. Which approach meets all these requirements?

Accepted Answer

Create a service-side auto-labeling policy in the Purview portal scoped to the Exchange location.

Answer

Configure a client-side auto-labeling condition in the label's policy settings and deploy the Information Protection client.

Answer

Publish a label policy that sets the credit card label as the default label for all Outlook messages.

Answer

Create a mail flow (transport) rule that applies content marking headers when a credit card number is detected.