Outlook Rules (Exchange Server 2000)

I would like to create a rule that can move all messages received from Internal Users (same domain users) to a folder called ‘Internal’ taking into consideration that all recepients (cc’s and bcc’s) should also be Internal Users.
The expected rule should be something like this:
“Apply this rule after the message arrives, sent to ‘Global Address List’ address Book and sender is in ‘Global Address List’ address Book, move it to the ‘Internal’ folder.”
The problem is, there is no option for checking that all recepients are internal users(domain users).
Is there any standard option I can use?
If not, what else can be used?
Is there any tool available to create custom rules ?
Sam