If you’ve changed the password for an email account you use on your Amazon Kindle Fire tablet, message sending and retrieval will fail. You’ll have to change the password stored on the device too. Here’s how.
1. From the home screen, select Apps > Email.
2. From the list of messages Menu > Settings.
3. You’ll have to change the password under the Incoming server and Outgoing server options.
4. Once you have changed the password under each option, tap Next and the password will be stored.