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My web host recognizes this was an error on their part and has composed a detailed email describing what happened indicating that they take full responsibility for the mistake. However, neither they nor I know the appropriate email addresses at these SE's to send this correspondence to.
Any help with this would be greatly appreciated. Snail mail addresses may be of use too.
Thanks,
Toby
Have them post the email as a web page on your old domain. Then go to
[google.com...]
and go through the process of notifying them that you would like to have all of the old pages removed. Use the page containing the letter from your host as the proof that you control the original domain.
That page will be read by someone at Google, and the old pages should be removed pretty quick. If your lucky, they might also look into the possibility of a penalty. But even if the don't, getting them to quickly remove the old pages will put you back on the road to recovery. I have yet to see a duplicate content issue turn into a permanent ban.