Server mail rule to forward only if recipient in Dom Dir?

I have set up mail rules to capture mail with certain words in the subject and body of the message and forward those to a mail-in database that I have created. I then go through this database twice a day and forward on messages that are legitimate. But half of the messages I capture are for ex-employees or made-up email addresses.

Is there any way that I can have the server rules forward mail to my mail-in database only if Any Recipient is in my Domino Directory?

Subject: Server mail rule to forward only if recipient in Dom Dir?

Hi,

There is a setting in the Inbound Restrictions on the config doc to only allow inbound mail for people listed in the Domino Directory.

Regards

Gregg