Exchange 2003 - How do I block external email addresses from being able to send an email to an internal email address?

I have set up a distribution group for internal use. I dont want any external addresses (hotmail etc) to be able to send emails to the group. It should be used for internal purposes only.
How can this be done?
gpersandAsked:
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peakpeakConnect With a Mentor Commented:
Disribution group Properties->Exchange General, mark From Authenticated users only
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rakeshmiglaniCommented:
there is an option to set delivery restriction in the group properties.
if you have a group which has all your internal users as members, then you can configure this new group to only accept messages from that group.
another option would be to remove the smtp address from this group's email properties and assign it a domain.local address
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amaheshwariCommented:
Assign Primary SMTP email address to this distribution group as @nomail.xyz.com or any other email address which does not exist and assign @localdomain.com as seconday email address so that only internal mails will flow.
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