Exchange DLP rules to block recipients of opposing domains


  • Hello Technet Forms,

    I have a requirement to block messages that are being sent to one or more domains on the same message. So as an example someone is trying to email but the message was accidently also addressed to a email. So DLP should block the message from sending. So far playing around with the DLP settings within Exchange 2013 it does not seem like this is possible at all. But I figured I would ask in case anyone else has tired this and gotten it to work.

    Wednesday, December 7, 2016 8:42 PM

All replies

  • I don't think that's a common use of DLP.  I think you should be looking at a transport rule.

    Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."
    Celebrating 20 years of providing Exchange peer support!

    Thursday, December 8, 2016 2:03 AM
  • Hi Nicholas,

    Agree with Ed, DLP is usually used to manage sensitive data, based on your requirement, you can refer to the following transport rule and check if any helps:

    Best Regards,

    Niko Cheng
    TechNet Community Support

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    Thursday, December 8, 2016 8:31 AM