Based on a suggestion I found in the BoonEx Forum, I added a Forbidden Email Provider function to design.inc.php file and over time have been adding email providers that I've found to be repeatedly associated with spammers... but not my members personal emails. This simple trick appears to help keep many spammers from setting up accounts on my dolphin site. As you can guess, I don't use it for Gmail, Hotmail and other very popular email providers... but at least I can eliminate many of the 'temp' see more email providers.