This should be easy, but I can't find it in the List Owner's Manual.

I have a moderated list.  A non-subscriber keeps sending submissions to my list, and I routinely REJECT them from LIST MODERATION.  I would prefer to have LISTSERV disallow the submissions and never see them in the submission queue.  How do I accomplish this?

Thanks in advance,
Aaron Morris, BEE-L Owner/Editor/Moderator