Interesting - I cannot access this website because the domain is blocked by my company. We have 2 enterprise blacklist solutions to stop people from going to websites they shouldn't.
It is a problem with the policies of your company. I don't know why they should have blacklisted our site, maybe they want to be sure that your email are managed by them :)
If you are curious, try to go on our italian website: qboxmail.it
Sorry, I was referring to the bitbin.de domain from which this post is written. I was providing vague proof that the domain's history may have caused it to be blacklisted.
The reason given is "parked domain".
Edit: I am referring to the bitbin.de domain