In my testing last week, both epub and mobi were accepted when I emailed them to my Kindle but every mobi file got me an email letting me know that Amazon would be dropping support for mobi. Most of the epubs looked pretty good converted to KF8/AZW3 but a couple looked like crap. Running epubcheck from Sigil and correcting the errors had those books looking pretty good as well. Overall, Amazon's process seems to be very unforgiving of most errors. Overall using calibre and sending via USB works better for me.
Quote:
Dear Kindle Customer,
Thank you for using the Send to Kindle service to send personal documents to your Kindle library. We noticed that the following document(s), sent by you at 06:03 PM on Mon, Jun 27, 2022 PDT are in MOBI (.mobi, .azw) formats:
* Title Deleted - Author Expunged.mobi
We wanted to let you know that starting August 2022, you’ll no longer be able to send MOBI (.mobi, .azw) files to your Kindle library. Any MOBI files already in your Kindle library will not be affected by this change. MOBI is an older file format and will not support the newest Kindle features for documents. Any existing MOBI files you want to read with our most up-to-date features for documents will need to be re-sent in a compatible format.
Compatible formats now include EPUB (.epub), which you can send to your library using your Send to Kindle email address. We’ll also be adding EPUB support to the free Kindle app for iOS and Android devices and the Send to Kindle desktop app for PC and Mac.
If you have any questions, please visit our help page or contact our Customer Service team.
Regards,
Amazon Kindle Support
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