Message rejection order

I have smartlist setup so that only subscribers can post plus I reject RTF/HTML mail. I have a problem in which the order these process. When a non-member posts RTF/HTML to the list, it gets rejected due to the content and get a notification message. They finally figure out what plain text means and re-send. This time it gets rejected since they are not a subscriber. Is there a way to change the order of this process. I would prefer that a non-member message gets rejected due to not being a subscriber before smartlist processes the other rules. Thanks