I have had quite a bit of success with greylisting, however in the last 3 or 4 months it has become less effective.
The vast majority of soam I get these days is from spam virus infected machines on DSL lines in the USA (sorry but it true). I was coinsidering adding features to smtpd and ratfs to allow regexes so I could add rules for DSL lines. Most ISPs seem to use a fixed format for the reverse IP addresses for their DSL accounts - though each ISP has its own unique format. There is also some work being done on an SPF validator at present but I will let them announce it as they see fit. -Steve PS: I have resurected Boyds script dws (Die Worthless Spammer) to send a complaint thought most ISPs seem to ignore them, but I feel I should try.
