The block list you're using, stopforumspam, apparently has a fairly complete list of Tor exit nodes. Those wanting to be anonymous will be using Tor (or another proxy service), so I'd like to ask you respectfully to reconsider banning Tor from your mail boxes. That said, I applaud your addition to the anonymous net :)
The Tor exit nodes are now filtered from the stopforumspam list, they are not banned any more. I was able to view the website using Tor.