Mail-enabled distribution lists

Hello,
I am having problems when sending to a distribution list.  We can use locally but out side email senders get a bounce back email from our exchange.  We use a lot of DL and need to get this working.  Thanks for any advise.
sparks24Asked:
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madhuskConnect With a Mentor Commented:
set the delivery restrictions from authenticated users to everyone.

This should resolve the issue
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jar3817Commented:
what are the permissions on the delivery options? It sounds like it's set for only authenticated users.
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sparks24Author Commented:
On the Mail Flow Settings tab its set to recieve from all senders and restrict no one.
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jar3817Commented:
hmmmm what's the message in the bounce?
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sparks24Author Commented:
Delivery has failed to these recipients or distribution lists:

accounting@1stchoicemail.com
Your message wasn't delivered because of security policies. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator.


--------------------------------------------------------------------------------
Sent by Microsoft Exchange Server 2007

Diagnostic information for administrators:

Generating server: TIT.local

accounting@1stchoicemail.com
#550 5.7.1 RESOLVER.RST.AuthRequired; authentication required ##rfc822;billing@1stchoicemail.com
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madhuskCommented:
Set the DL as universal security group, then the issue will be resolved
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sparks24Author Commented:
Converted to universal security from universal distribution and still no luck.

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sparks24Author Commented:
There is a little check boxes that needed to be unchecked.  I kept missing it.  Thanks.
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