I've also been banned by my ISP due to spam from MLF. Although I had mathematical CAPTCHA enabled on new user registrations, hundreds of fake users were created and MLF sent out emails to these users. Due to these emails I was banned, and my domain and IP ended up in all sort of spam filters. Is there any way to fix this? Now I have closed automatic registrations and have potential new users contact me and I create users manually – which is a pain.