Originally Posted by rstoothoff
Recently an e-book converted with Calibre from .epub to .mobi (both old and new), which looks good on both the Kindle Previewer and Kindle devices, has been rejected by Amazon, who say it must be generated through Kindlegen. I've tried using Kindlegen, both with the InDesign plug-in and with Kindle Previewer, but got an imperfect .mobi (one lacking the all-important Kindle TOC), whereas Calibre seems to deliver the goods. What's wrong?
Does the rejection/error message give any other details? I've recently (within the past 10 days) uploaded a Calibre-generated .mobi file to KDP without any problems.