Upload books to Kindle without sharing your email password

I just started to use kindle and I’m little bit disappointed that there are no simple way to upload a book into my ‘Your Content’ area. The only way is upload by email.
I don’t like idea to authorize any 3d party software to send email on behalf of me. Idont want to save my email password into book library software.

So I started my research and I found easy way to upload books .
If someone is interested, please welcome.

My starting point was following, when you are sending email to your mail provider SMTP protocol is used. Exactly the same protocol as sending email to your secret@kindle.com account.
So why not to send a book to @kindle.com directly?

I run ‘dig kindle.com mx’ command to see what smtp server receiving mail for kindle.com domain.
It is retail-smtp-in.amazon.com.

See below simple instructions for Calibre library to upload books to amazon.

1. Open your Content Settings
https://www.amazon.com/mn/dcw/myx.ht...ttings/payment
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Scroll down to ‘Approved Personal Document E-mail List’.
And authorize your secret@kindle.com email to send email to your kindle.

2. Use following settings in your Calibre library
Send mail from: your secret@kindle.com email.
SMTP Hostname: retail-smtp-in.amazon.com

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