If you are meet the terms of their licenses, you can re-enable DCC and Razor2 by uncommenting the appropriate lines in etc/mail/spamassassin/v310.pre .
If you decide to enable Domain{{`Keys (in the same file), you will need to install Mail::Domain}}`Keys if you don't already have it. It's available via CPAN or directly from http://www.cpan.org/modules/by-module/Mail/Mail-DomainKeys-0.21.tar.gz
Placeholder for upgrade instructions for 3.1.0.
Please feel free to go ahead and start populating .