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> Why doesn't kindle support epub out of the box.

Almost definitely money. Amazon want you locked into their ecosystem as much as possible.

I put all my books on my Kindle through Calibre - couldn't care less about the format.

Rename it png and email it.

Seriously? I can't tell if this is a joke or not.

But you do bring up an interesting point - I'd forgotten about ingestion via email. Worst case I suppose one might construct a pipeline that does conversion from epub to mobi and emails the result.

Is there a limit to the size of the library I wonder?

You can send epub to your send to kindle email address with the word “convert” in the subject line and it’ll transform it into a mobi... as far as I know..

Edit: apparently you need to change the extension to .zip for it to work shrug

It works, you can also use the Send to Kindle app (which is barebones but gets the job done).