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You can e-mail "dual format" ebooks which contain both a Mobi and a KF8 version of the book. (Amazon's "Kindlegen" tool creates such books.) When Amazon's servers subsequently deliver the book to a device, they send either the Mobi or the KF8 version of the book, depending on the device or app capability.
What you can't do is email a "pure" KF8 book without a Mobi component. (You can email a pure Mobi book, but not a pure KF8 book.)
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