I don't know what processing Amazon actually carry out in the email process. It may be that they do their own conversion or repair? If you import a book to Calibre are you able to read it with the Calibre ebook viewer? If not, what error message do you get? If you care to put one of the files in question on a hosting site and pm me a link I will see if I can find the problem. Even if I can't, others may be able to. Just don't post the link. Only PM.
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