Just checked if you mention bounces and saw that you track bounces; how does your app show / keep track of the bounces and more importantly of the bounce rate in general?
I'm mentioning this since Amazon SES will place your account under review if your bounce rate is 5% or greater; you can find a few useful links on this comment thread: https://news.ycombinator.com/item?id=21955614
Best of luck with your app!
Disclaimer: I was responsible for the implementation of an e-mail notification system using Amazon SES.