Hello itr,
Such problems are not isolated to a domain, user, host or server. It can occur to anyone. Hotmail updated its anti-spam scripts some time back, around March. Since then people have been gradually trying to adapt to Hotmail's strict policies.
Most probably your Rackspace tech staff must've changed the IP or added a reverse DNS entry or added/removed mail headers to the liking of Hotmail.
Such problems occur everywhere, not just eUKhost or any other particular service provider. I have a server listed at SORBS but they wouldn't remove it without charging 50 USD, with no guarantee that it won't get listed again, since the listing program is automated. So many mailservers use SORBS's lists for filtering. In such cases, it becomes impossible to rule out such issues.
But, If there is a problem, there must always be a solution too.
Regds
IJ
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