As spamassassin source does NOT include rules anymore, you have to run "sa-update" script then restart "/etc/rc.d/rc.spamd", in order to retrieve updated rules, *BEFORE* using spamassassin or spamc for the first time, after its installation or upgrade. Downloaded rules will be installed in a sub-directory of /var/lib/spamassassin// directory: don't manually move them! Upstream developers recommend rules to be kept up-to-date regularly. A really minimal cron script is provided in /etc/cron.weekly/ to dynamically check, download and install new rules every week. If you need a different periodicity you can move the cron script accordingly.