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A lot of web sites still talk about mobi like it's the standard. But the azw3 format has more wiggle than the original mobi format with respect to what it can display. Adding to the confusion is that a mobi file can contain both the azw3 formatted book as well as the original mobi formatted book; that's why the mobi was so much bigger. Newer ereaders will use the azw3 format while very old ones that can't use azw3 will use the old/original mobi format.
So if the only options are mobi and epub, I'd get the epub and convert to azw3. But I don't remember the details/restrictions about using the email to kindle feature since I always load books with calibre.
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