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Can I block External e-mail while allowing unauthenticated internal e-mail in Exchange 2007?

fpthree
fpthree asked
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Last Modified: 2012-05-07
We have some products that generate unauthenticated e-mails that need to go to internal users who are not allowed to receive e-mail from outside of our organization.  Typically the way to block some users from receiving e-mail from the outside is to only allow e-mail from authenticated users.    If we take off the authenticated users only restriction they can receive these e-mails but then they get all of the outside e-mail as well.

I already use a distribution list and a transport rule to keep these users from sending e-mail to the outside.  I tried creating Transport Rules to block members of the internal e-mail only distribution group from receiving e-mail from outside the organization so I could allow unauthenticated internal e-mail but it doesn't appear to work.  Is there a way to do what I need to do?
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