Solution for Spambots such as Forum Equaliser, and BadderAdder

Hi

Like a lot of forum managers, I've had to switch all my forums over to manual authorisation to avoid being swamped by fake registrations and the flood of porn and pharma links and posts that come with them. The problem is that they seem to have no problem getting through the visual identification hoops.

Nevertheless it's taking about an hour a day just to clean out the registration applications of these "human cockroaches" so that they are wiped from member lists.

Has anyone found a solution yet to keeping them out altogether?

Cheers
Christine