We have made a major improvements in Mailspect Defense to our WBL processing for antispam system designed for email service providers. We have reduced the queries to MySQL from 6 to 1 and we have have also introduced precedence for tighter controls. Now more specific WBL entries to take precedence over less specific. If a user whitelist a domain he can blacklist an individual contact from a domain. For example he whitelists domain yahoo.com but blacklists a contact anoying.man.from@yahoo.com It sounds reasonable in general. We used to always prefer whitelist entries, now we don’t. This is required to scale WBL’s as the scale to millions of entries, as we see with the email service providers and antispam services who use Mailspect Defense.