A similar thing happened to me while using their Mandrill system. After years of using it with no issues, all of a sudden no emails were getting out. They shut

A similar thing happened to me while using their Mandrill system. After years of using it with no issues, all of a sudden no emails were getting out. They shut us down without notice and without recourse. We were sending simple support emails, and auto-emails (when you register, forgot your password, etc). Absolutely would never recommend.