I'm having the same problem - trying to send one book in AZW3 format to two Kindles and it's not arriving, nor is there a message of any kind from Amazon. It was converted with Calibre which shows the book was sent successfully.
I haven't changed any of the settings in Calibre, or the kindle email addresses and it's being sent from an Amazon authorised email. I tried to the free.kindle email addresses and the ordinary ones. I don't see anything on Amazon's preferences page to say that anything has changed so I'm at a loss as to what to do now. Has anyone got any suggestions, please? The account the Kindles are registered to is a prime account and I have a lot of fiction and reference books associated with i so I don't want to reregister the Kindles elsewhere
TIA
ren
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