[odamizu]

Originally Posted by tirion

... Wait, let me see if you understood you correctly:
I create (or take if already at hand) the ePub version of the book in question.
Then I change the extension to ".png" (an image format?) or ".txt" and send it via eMail to the address of my Kindle.
That does the trick for you, to make whispersyn work more reliable

Yes.

KindleGen is Amazon's mobi creation software. It converts epub (and other formats) into a mobi file that contains an azw3/KF8 component and an old mobi format component. This is similar to Calibre's mobi-both.

I found that while Calibre mobi-both files usually work, occasionally they fail to sync or have other problems. When that happens, running the epub through KindleGen always fixed the problem for me, so I switched to KindleGen.

You can run KindleGen in a variety of ways:

• download the command-line tool from Amazon
  
• use Amazon's Kindle Previewer, which has KindleGen embedded in it and has a more user-friendly GUI
  
• use Sigil with Doitsu's KindleGen plugin
  
• use Send to Kindle
  

Send to Kindle is the easiest. Officially, Send to Kindle does not accept epub files, but if you change the file extension to .txt or .png (yes, an image format), Send to Kindle thinks it's .txt or .png rather than .epub and will accept it, run it through KindleGen, and voila, you get a dual-mobi file in your Kindle Personal Documents library that syncs. iOS (and Android??) will receive old mobi format, so the cover works, but eink Kindles get azw3/KF8, so no cover.

Using the Send to Kindle desktop app is preferable to email because then you can input the title and author. If you Send to Kindle via email, the title will be the filename and the author will be the email address.