How do i restrict users/groups from emailing each other internally in Exchange 2003?

I have already restricted the email of this is group from sending and recieving internet email, I want stop this users/group from sending emails to others in the domain, but able to send emails to each other in the group.
How please?
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MesthaConnect With a Mentor Commented:
With Exchange 2003 that isn't possible without a lot of work.
You would have to place restrictions on all other users in the domain to NOT receive email from those users. Exchange works on the basis of everyone can email everyone else, but those listed.
You could add the users to a group, and then add the group to every other user, I am pretty sure that will work.

Alan HardistyCo-OwnerCommented:
On the Exchange General Tab, Delivery Restrictions Button, you can add a restriction to stop receiving emails 'from everyone except'.
In this area, add your users in the group and job done.  I just hope you don't have hundreds of users. ;-)
Alan HardistyCo-OwnerCommented:
Add this rule to all the users not in the group and job done.
BrookdalealAuthor Commented:
That did it, thanks.
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