I recently added a field to the database for the submitters IP address so I can add the spammers to the ban list. It appears that some submitters are blocking their IP addy as there's nothing in the field on some of the subs. Is there a way to block those by using wild cards in the ban list? Or maybe just a blank line would do it. Alternatively, will changing the field to "not null = yes" have any effect?

Thanks