I installed Mollom on my test website, but all my attempts to fill captcha was refused.
Later I found that it is not problem only of my website, but I cannot fill Mollom captcha on any website using Mollom (including mollom.com).
When I tried to send this message over contact form on mollom.com I got this message: "Your submission has triggered the spam filter and will not be accepted."
I am currently connected over ISP in Czech Republic and have IP address 18.104.22.168. It seems under same IP address are all clients of that ISP.
Seems like critical bug as there is no way to post anything for me on websites using Mollom.