The reply would be the difficult part to prevent. I can only think of a few coding options, none of which are appealing or simple. You can modify the memo form to validate the addresses, and if your "All Users" group is in there, then check to see if they have access. If they don't, then deny the send. The separate address book is the best method, but even that won't prevent a reply. I would suggest that an email policy address this issue, and make sure everyone understands it and abides by it. If they are sending messages to everyone, perhaps there is a need you could fill with some document library type databases. You could setup an announcement database that people should check on a regular basis. That's my usual suggestion when this issue occurs.
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