MSExchange distribution list management restrictions

I have a distribution list that sends and email to the entire organization using MS Exchange 2010.  How do I restrict users to those authorized to send to the distro list and deny others?

Kinda for a DDOS and profesionalism thing?
Thanks
LVL 9
Evan CutlerVolunteer Chief Information OfficerAsked:
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SEHCCommented:
HI

take a look at this artical this should anwser your question

http://exchangeserverpro.com/restrict-distribution-group-exchange-server-2010/
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s3e3Commented:
Great idea, very common to do this.

Use Accept Messages From setting in the Message Delivery Restrictions, and specifying mail-enabled groups who are allowed to send to the list.
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Evan CutlerVolunteer Chief Information OfficerAuthor Commented:
This is awesome.  worked first time.
Thanks much.
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