Hello Kate,
Believe me when I say no-one can share your pain better than I do. It seems you're having the same problem I was having. Don’t worry you can make it go away.
Just to start feeling a bit better try what Useless Warrior pointed out to me in the other thread, it worked wonders for me (Thanks again UW

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Quote:
Zio - contact your host and inform them that the IP you are on is blacklisted by SORBS and see if they can handle the issue for you. Also, if I use the this link, with your domain in it, http://whois.domaintools.com/toxsite.com it shows that your server's IP is blacklisted. But if I got to http://whois.domaintools.com and then enter your domain, it says Blacklist Status: Clear - weird, eh?
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You’ll see that your domain is both blacklisted and not!
And here is where I join the crowd. 2 things:
1) Get paid hosting (which you’re doing).
2) Get a different IP by changing your ISP. [If you have Telecom Italia dump it with extreme prejudice. In my case it is Telecom’s fault if I had my IP blocked and domain blacklisted, and I suspect this might just be your case as well. SORBS has evidently blocked a whole range of Telecom’s IPs and the only solution would be for the two to clear things out between them:

Fat chance!!! I took care of #1 and got a new provider. Do what you will but if I were you…]
That’s all you need.
Good luck.