that's tough, you can edit the registry to limit the number of recipients in an email, but server based DL's can circumvent that if the user's are allowed to send to them. I know it's not what you're looking for, but I would create a DL with the names of any users that are abusing this (hide the membership, of course), and put that DL in the "Reject messages from" field of all your other DL's until they can behave themselves....
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