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Problems With Email Distribution Group

jhall0528
jhall0528 asked
on
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Last Modified: 2012-05-09
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 sales@mydomainname.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 "sales@mydomainname.com"
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,

Thank You
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