More statistics ?Benjamin, those are very intresting and impressive numbers. If only 5% of the none-spamming users have to fill in the captcha, that means a lot less people that are frustrated. Do you have statistics of the number of wrongly classified messages ? 1) Messages that were classified as ham (both those that were classified directly, and those that passed the captcha), but were marked as spam by the administrator later on (false negatives) ? 2) And, even more important: messages marked as spam by Mollom, but that were actual ham messages (false positives) ?