Have you contacted Dreamhost tech support? Sounds like a problem at their end. I've got a number of redirected domains and subdomains, and they all work fine as far as I can see.
Incidentally, HTML-based redirection is a clumsy way to do it... if you need to do a URL-redirect at the web-file level rather than by server setup at the control panel, a better way is with .htaccess files:
RedirectPermanent / http://yoursite.example/