Learn About Two-Factor Authentication for Your Kindle Library

Two-factor authentication is a security step that helps ensure you only receive documents from sources you trust.

Need to update Personal Document Settings? You can find this and many other options by going to: .

When you send a document to your Send to Kindle email address, you receive an email asking you to verify your request within 48 hours. Avoid two-factor authentication by making your Send to Kindle email address sufficiently secure.

Ensure your Send to Kindle email address is different than any other email addresses you use.
Use a combination of uppercase letters, lowercase letters, and numbers.
Avoid including any personally identifiable information.