The problem here is that the server is what is performing the lookup for the group in the Domino directory when the mail is sent, not the client. There have been many interesting attempts at circumventing the problem, the best of which is to use a personal address book that is only replicated to the local machines of those that should be able to use the group, and there is No Access to the server replica by anyone else. Unfortunately, in your case, it appears the agent is running on the server, and therefore, the server must have access to the group. The good news is that you can prevent this in Domino 6 by using mail rules at the server level. The only way I have thought of to solve your problem would require modifying the mail template so that there is a field with a validation formula that looks at the recipients fields and if the group name exists, produces a failure message to the user. This would prevent the message from being sent.
Dig Deeper on Domino Resources - Part 7
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