I seem to be banging my head on what should be a pretty straighforward situation.
I am trying to create an email distribution group, I'll call it email@example.com
This is what I've done so far;
1.) opened the exchange management console
2.) expanded recepient configuration
3.) Completed the new distribution wizard
4.) added a few emails addresses to the group
If I send an email from within our organization it works fine, however if someone outside
our organization attempts to email this email address "firstname.lastname@example.org"
they get a bounce back;
#550 5.7.1 RESOLVER.RST.AuthRequired; authentication required ##
I'm running Microsoft Exchange Server 2007 .08.01.0359.002
Please advise what I've done wrong,