with advice from:
http://lifelogs.com/spam/spam.html
and:
http://paste.lisp.org/display/4589
(setq spam-use-BBDB nil
spam-use-stat t
spam-split-group "mail.spam"
spam-stat-split-fancy-spam-group "mail.spam"
spam-install-hooks t)
(setq nnmail-split-fancy
`(| (: spam-split)
;; insert usual split rules in split-fancy syntax
"mail.misc"))
(from http://sacha.free.net.ph/notebook/emacs/planner-config.el )