Seems to be working pretty well, at least from my perspective. There are a few human spammers out there that have emailed to request accounts. But like the machines, they’re pretty easy to spot. (I’m not going to say how, lest they are reading this.) I’m not sure if they are clueless small business owners, or cheap Indian and Chinese labor. (They all use gmail, hotmail, or yahoo accounts.) My favorite was from a human spammer whose message to convince me that he was human was “thanks for keeping the spammers out.”
The advantage to this new system is that accounts are held in limbo, unable to post or cause any damage. Then I can delete the pending accounts after a couple of days, knowing that any real participants will have emailed me. It takes the pressure off, and I don’t have to be constantly monitoring the board for spammers that leak through.