Microsoft Exchange Server 2016 PowerShell Cookbook - Fourth Edition

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DLP policies are collections of mail flow rules (also known as transport rules) that contain specific conditions, actions, and exceptions that filter messages and attachments based on their content.

After creating our first DLP policy, we can easily check which rules were created for it by using the Get-TransportRule cmdlet:

We can further expand on each rule to find out what exactly they do by looking at their MessageContainsDataClassifications property:

    (Get-TransportRule "U.K. Financial: Scan email sent outside - high count").MessageContainsDataClassifications  

In the preceding screenshot, we can see that the "U.K. Financial: ...