As mentioned in the topic...
The odd thing is that when I created a new test DL, with RequireSenderAuthenticationEnabled set to $True, and it works - will rejected external emails... but the old DL will accept?!
Is this a bug?
Our current Exchange server version is SP2 with Rollup 5-v2.
Version: 14.02.0328.009
Thanks a lot for the help!
Regards,
Qiang
Thank you!
