Setting up a mail contact in exchange for a domain and not a single address

I am setting up a distribution group and I am trying to make it so that the only emails this group recieves is from a single domain.  I have been able to get the restriction to work a for single address using a mail contact but not for a domain without adding each individual address.  Suggestions
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rdare23Asked:
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Glen KnightCommented:
If Exchange 2007/2010 you can do it with a transport rule.  Otherwise it's not possible without writing SMTP Event Sinks
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Adam BrownSr Solutions ArchitectCommented:
You can modify the Delivery restrictions and add a Distribution list to the list of users that are able to send to the distribution list you want. Basically, you would create a distribution list that only includes users in a specific domain, then create another distribution list that includes the users that need to receive the messages. Add the domain DL in the Delivery restrictions as allowed to send mail, again assuming Exchange 2007/2010.
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