I am an overall happy customer of Mandrill. But they have a reputation system which sets a hourly quota. If your reputation gets hurt, your hourly quota could g

I am an overall happy customer of Mandrill. But they have a reputation system which sets a hourly quota. If your reputation gets hurt, your hourly quota could go down significantly. I had a client who once got tagged as a spammer and that brought down the hourly emails quota to literally 2 digits and it was in thousands before. But mandrill is very good at improving the reputation as well if you use it correctly. Also, they do send you emails everytime your hourly quota is adjusted. So that is your signal to check and ensure that emails can still be sent.