you can try your luck with:
Please note that I do not accept or consider any unsolicited material, ideas or suggestions of any nature whatsoever. This is not the way to get me or anyone else to represent you or your idea. Accordingly, do not submit unsolicited materials to me. Should you ignore this express prohibition, then know that any such unsolicited materials will not be considered by me nor by anyone at my company. Further, unsolicited materials will not be forwarded to or discussed with any third parties. Seriously.