I started to get interested and then realized it's yet another monthly subscription based email platform. One of the main reasons SES is popular is it is pay what you use. In addition, it's not immediately clear if SMTP is supported, but you might want to add that if not since it's the standard. Your api might be cool but avoiding vendor lockin is cooler.
We do in fact support SMTP - we'll work to make that more prominent. And I understand your take on the subscription model - we're chewing on some pay-for-use models.