Kindles will continue to support MOBI format going forward, you just won't be able to send it via email. You can sideload MOBI from calibre via USB or you can put the MOBI file on a web server (such as calibre's sever) and download it to the Kindle using the web browser.
If you send an EPUB to a Kindle via email the resulting document will be delivered in KF8 (azw3) format and will lack special periodical handling and a cover thumbnail image.
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