Amazon still won't convert a user's Epub ebooks to Kindle format, but luckily there are alternatives such as Calibre or the converter Reedsy launched a few weeks ago.
I got an email from Reedsy on Friday which brought the converter to my attention. I didn't have a chance to play with it until today, however. The converter has a simple interface; you just drag your Epub file over the window, and let go. You'll then be prompted to enter your email so the resulting Mobi ebook will be sent to you, and that's it.
I tested the converter just now. The Mobi I made from an Epub file arrived quickly and looks just as good as the the Mobi I got from from the publisher, although Reedsy's file is well over twice the size.
All in all, it's always good to have another option.
Have you tried it yet?