It happened to a friend of mine as well. The server banned his IP address saying it was a spam address. It gives a link in the Ban message to the person to contact Bizhat and address the issue. He has had no reply in 3 weeks.

I have also posted on these forums with the problem and contacted the forum admin. No reply in a week.

I know this won't help you get the answer, just letting you know that support may take a while.