running a site wide SA 2.6 setup, some XXX html only mails are impossible to stop, getting scores as low as 2.0
the email just calls images, and thats about it. should i paste the subject here, they are quite distinct, and im sure others are getting them.
Are you using the Mail::SpamCopURI add on to check the SURBL system?
SURBL is pretty effective against the weblink-only and weblink+image only types of spam. It's basicaly a domain-name based DNS blacklist that is queried for domains contain in URLs.
http://www.surbl.org/
SpamCopURI for SA 2.6x can be downloaded here: http://sourceforge.net/projects/spamcopuri/
SpamCopURI installs more-or-less as a patch to the code your existing copy of SA. It modifies EvalTests.pm and adds a .cf file to /etc/mail/spamassassin to call the new eval.
(no need for SpamCopURI if you're using SA 3.0 or higher, SURBL queries are enabled by default with SA 3.x)