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Is there a way to restrict an exchange distribution list email address to Allow All external, but only "A", "B", and "C" internal?

Vermont1981
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To allow all external messages and several internal senders, you could check the "Senders inside and outside of my organization" in the distribution group's "delivery management":

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Then create a transport rule to reject the rest internal senders' messages(Condition: The recipient is a member of the distribution group and the sender is , action: Reject the message with the explanation(You could choose to delete the message without notifying anyone)): enter image description here enter image description here

After that, the messages which are sent from the several internal users to the DL will be rejected, and these internal users will receive a undeliverable message if you reject messages with an explanation or enhanced status code.

Ivan_Wang
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  • That's quite a hinky workaround. I like it. Let me give it a try and see if the available settings match my use case. – Vermont1981 Apr 15 '20 at 13:43
  • Hope everything goes well with you :) – Ivan_Wang Apr 16 '20 at 08:17
  • Hi, i'm here to confirm the progress of your thread, if the issue has been solved, you could mark the best answer to help people who have the same problem. Have a good day:) – Ivan_Wang Apr 22 '20 at 10:15