Data Loss Prevention - Attachments External E-Mail

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Occasional Contributor

Hello every one, 

I hope you can help me a little. I am sitting on a small problem.
I apply a label to a document like Internal. According to the policy the sharing of this content should not be allowed. Preventing sharing via sharepoint and onedrive works fine. Unfortunately it is still possible to send the document as an attachment via Exchange.

Does anyone have an idea why?

1 Reply

If I label the email as Internal then sending the email is prohibited. Unfortunately, the attachment is not recognized as internal.