For sending to Kindle you need to send Mobi files. It won't accept AZW3. Apparently you can send some kind of hybrid of the two which Calibre can do but I don't know how to do that and I've been told you don't get covers if you do that, which I need.
Assuming you don't need an embedded font then mobi files are the ones to send. The books then appear in the Amazon cloud and can be whisper synced between devices just like any Amazon bought book.
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