You mean this feature of Outlook? https://blogs.msdn.microsoft.com/microsoft_press/2013/04/29/from-the-mvps-data-loss-prevention-with-office-365-and-exchange-on

You mean this feature of Outlook? https://blogs.msdn.microsoft.com/microsoft_press/2013/04/29/from-the-mvps-data-loss-prevention-with-office-365-and-exchange-online/ https://blogs.msdn.microsoft.com/microsoft_press/2013/04/29/...