Installing SA-Bogofilter. Bogofilter.pm will have to go into /usr/share/spamassassin (or wherever you keep your SpamAssassin cfs, along with 10_bogofilter.cf. You will have to create a directory called /var/lib/bogofilter (or hack the source) where the wordlist.db files will hang out. This directory must be owned by the same user spamassassin is executing as. If you change this directory, again, you must hack the source. You must have perl installed as well, but I'm guessing if you have SpamAssassin, this is probably all set.