Exchange DLP Rules in Exchange Management Shell

This one took a while to work out, so noting it down here!

If you want to create a transport rule for a DLP policy that has one data classification (i.e. data type to look for such as ‘Credit Card Number’) then that is easy in PowerShell and an example would be as below.

New-TransportRule -name “Contoso Pharma Restricted DLP Rule (Blocked)” -DlpPolicy ContosoPharma” -SentToScope NotInOrganization -MessageContainsDataClassifications @{Name=”Contoso Pharmaceutical Restricted Content”} -SetAuditSeverity High -RejectMessageEnhancedStatusCode 5.7.1 -RejectMessageReasonText “This email contains restricted content and you are not allowed to send it outside the organization”

As you can see, and highlighted in red, the data classification is a hashtable and the single classification is mentioned.

To add more than one classification is much more involved:

$DataClassificationA = @{Name=”Contoso Pharmaceutical Private Content”}
$DataClassificationB = @{Name=”Contoso Pharmaceutical Restricted Content”}
$AllDataClassifications = @{}
$AllDataClassifications.Add(“DataClassificationA”,$DataClassificationA)
$AllDataClassifications.Add(“DataClassificationB”,$DataClassificationB)
New-TransportRule -name “Notify if email contains ContosoPharma documents 1” -DlpPolicy “ContosoPharma” -SentToScope NotInOrganization -MessageContainsDataClassifications $AllDataClassifications.Values -SetAuditSeverity High -GenerateIncidentReport administrator -IncidentReportContent “Sender”,”Recipients”,”Subject” -NotifySender NotifyOnly

And as you can see, shown in red above, you need to make a hashtable of hashtables and then use the value of the final hashtable in the New-TransportRule