Using Exchange 2010 SP1.
I have a newsletter come to my email which I 'redirect' to our whole organisation via 2 distribution groups. These are company-wide distribution groups which I do not particularly want available externally.
It works if the distribution group is set to allow senders that are unauthenticated (thus any Tom, Dick or Harry in the world can email to these distribution groups).
It doesn't work if the "Require that all sends are authenticated" is checked.
Why is the Exchange server's rule processor considered a non-authenticated user and is this fixable? Or I have I just screwed the settings somewhere when I set this server up?
edit: Apologies, don't know how this made it into the DNS area.