*If you 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 . You should also be aware that the API changed in version 0.80 of Mail::Domain``Keys which stops it from working with SA. Patches to fix this are available at http://issues.apache.org/SpamAssassin/show_bug.cgi?id=4623