Rate Limiting Email system - Hundreds of thousands of companies use Amazon's SES system for sending transactional and marketing emails from their servers.  However, SES comes with a risk - if any one email address or system goes out of control, then AWS will shut down your entire SES account - leaving you without the ability to send outbound emails. We build a rate limiting system, using serverless lambda functions, to intelligently detect if a particular email address was sending out of control our bouncing too frequently.  If so, our system automatically disabled the outbound email account and informs an admin user. We created a portal that allows someone to test, re-key email accounts and see specific insights on which emails are sending and being blocked.