Summary: The Amazon Appstore sends all general developer communication emails, as well as test results and remittance emails, to the email address listed as your company email address, in your Developer Portal. We currently only support sending emails to one email address, therefore we recommend using an email mailing-list or shared mailbox for your company email address, if you would like messages from the Amazon Appstore to go to multiple people.
You can update your company email address in your "Settings" menu of the Developer Portal. Simply go to the "Company Profile" page and update your company's email address.