I have made the ScamNailer database of phishing email addresses available as a ClamAV ".ndb" signature database file. All you need to do is download the file from once every hour and put it into your ClamAV "Database Directory" which is defined in your clamd.conf and/or freshclam.conf file. It's usually somewhere like /var/clamav. Then tell your clamd to reload its database (sending it a "kill -HUP" should do the trick) so it knows something has changed.

Note: Please do not download this file more than once every hour, it does not change that frequently and you will overload my poor little web server!