> Kindles do not have support for ePub. You need to convert them to a Kindle format.
I think that was true for first Kindle versions. I have a Kindle 10 and Amazon discourages using MOBI and recommends using epub format.
https://www.amazon.com/gp/help/custo...WYD9SAF7PGXRNA
However, I've sent to my Kindle tens (maybe hundreds) of epubs. All my ebooks are epub and worked with no issue.
> If you got an error sending via email, it could be the email address you sent it from is not white-listed, or the ePub has some formatting errors in it.
Email address is good for sure, almost all my ebooks are sent to Kindle through email. Pitty Amazon doesn't detail on what went wrong.