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If your query is about the notification related to the app you have submitted, then the answer would be "When you submit an app in the Amazon Mobile App Distribution Portal, you can track the approval status of your app at any time by signing in to the Distribution Portal and finding your app in the Dashboard on the homepage. If we have a question about your app during the review process or determine it does not meet one of Amazon’s acceptance criteria, we will notify you using the e-mail address associated with your account and provide guidance on next steps. We will also notify you once your app successfully completes the testing process. At that point, your app will be made available to publish and merchandize on Amazon Apps." But if your query is about any messaging service available for the development purpose, then please refer the below link for more information http://aws.amazon.com/sns/