Paul,
Is anyone else recommending or not recommending greylisting and what are your experiences. Seems like surbl should get more effective over the
Greylisting rocks, however I've been building a greylist whitelist to help get over the problem of various people who run non-compliant systems.
So with a good list of trusted netblocks not to greylist, it is even more effective. I've been sharing this with a few people, if you or anyone else is interested please mail me offlist.
Regards,
Joseph