I've just started getting a few of what appear to be spambot registrations at my blog. I'm almost certain this is what they are because as soon as they register, my Subscribe2 plugin daily digest notice sent to them bounces with a "user unknown" message.
Has anyone heard of a captcha feature for blog registration or some other way to protect fr. bot registrations?
I should add that I have SK2 & BB installed & they are successfully blocking comment spam--but not contact form & registration spam.