I think there may be some using SES that may need support if they can't get SES/SNS working. Support for that is with Amazon, not this app dev. Sparkpost/Sendgrid you plug in an API and that's it. With SES you need to set up your sending methods and then learn how to set up SNS. This is why I mention creating notifications to an email address so you can verify you have that working. Then use the app.
For anyone planing to use this app with SES, that would be my one big suggestion... get Amazon SNS working now to your email address. Learn how to create topics and subscribe to them. Read up with Amazon SES/SNS. Its not difficult. Once you have it working and you are receiving Bounce/Complaint notifications to your email, you'll know that notifications are working from Amazon SES/SNS. You will then basically switch your subscription method from email to an https (endpoint url for your site that will receive these notifications within this bouncer app).
If you are using SES now, set up and test email notifications with SNS by each sending email address, not domain name. My main issue why I could not get this working was because I set up SNS to my domain name instead of the sending email addresses. I just figured that out today after messing with Amazon on and off this week. I had thought it was "catch-all" by domain name until I read online each email address has to be subscribed to a topic to send out notifications.