i gave up trying to do creative spam filtering long ago. email address obfuscation, greylisting, etc. i put my domains behind postini (shame they got bought o

i gave up trying to do creative spam filtering long ago. email address obfuscation, greylisting, etc. i put my domains behind postini (shame they got bought out by google) and never have to deal with spam anymore. my e-mail address is in plain sight in lots of places, and i only get false positives once in a rare while that i have to login to postini and forward to my inbox. same thing with spam comments on my site. i didn't bother with captchas or other annoying requirements like openid. it submits everything through defensio (http://www.defensio.com/ http://www.defensio.com/) on the backend and if it looks like spam, you just have to put in an email address to manually confirm the comment and re-train defensio. otherwise people can leave anonymous comments without any hassles. the amount of comments that need to get manually verified are very low, and i never see spam get through.