What is KDP’s E-mail Address?

KDP does not list a direct email address for support.
However, they do provide support through their Help Page:

1. Go to https://kdp.amazon.com/en_US/help
2. Sign in to Your KDP Account
3. Select the topic that best matches your question.
4. Scroll to the bottom of the help article and click on the ‘Contact Us’ button. You’ll have options to start a chat or to schedule a call back.

If you’re unable to find what you need on the Help Page, try reaching Amazon Author Central Support:

1. Go to https://author.amazon.com (or your country's specific Author Central website, such as author.amazon.co.uk for the UK).
2. Sign in to Your KDP Account
3. Once logged in, click on "Help" at the top of the page.
4. Scroll to the bottom of the help article and click on the ‘Contact Us’ button.
5. Select the relevant topic (such as book details, sales data, or other account-related issues).
6. You’ll have options to start a chat or to schedule a call back.

If you’re unable to access Author Central or resolve your issue, you can also try contacting general Amazon customer service and ask to be connected to Author Central.
Following are the websites for Amazon Author Central in each Country:

1. United States
   https://author.amazon.com
2. United Kingdom
   https://author.amazon.co.uk
3. Germany
   https://author.amazon.de
4. France
   https://author.amazon.fr
5. Italy
   https://author.amazon.it
6. Spain
   https://author.amazon.es
7. Japan
   https://author.amazon.co.jp
8. Canada
   https://author.amazon.ca
9. India
   https://author.amazon.in
10. Australia
    https://author.amazon.com.au