This is my list of Banned Email Domains on my wpmu. You can use to protect against spammers with another protection tools. You cat put this domain in your WPMU admin on Option -> Banned Email Domains. .co.cc 2424blog.com 900-numbers-livetoday.co.cc azbestsellers.com buffalomission.org conficker-worm-removal.com d6327.com dazzlepedia.org danielamail.com dentistinnewportbeach.com discoverrome.org ddoforums.com emaildesechable.info emailfile.info emailftw.info fatbookmarks.com filmstarwallpapers.com free-drumlessons.com [...]