If you really feel Move Reminders are spam, and you have explicitly told to site administrator that you don't want them, send sample email and your correspondence with admins to 'abuse@rackspace.com' address. They can help you if they feel your pain 🙂 I personally think redhotpawn.com is violating http://www.rackspace.com/aboutus/acceptable_use.php.
I understand totally your point, as I recieve over 2000 emails/day on a bad day + plenty of SMS's.
HTH HAND
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J