I have the same issue that my MOBI file isn't accepted, but MOBI is still listed as a supported format in the error email I received (which also mentions that "Later this year, 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").
I hope that is only a temporary issue. It would be a major bummer if MOBI is discontinued before EPUBs are accepted via the "Send to Kindle" PC app.
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