A question I couldn't see answered on https://www.markdownmail.io/
Is this a GUI to my AWS SES account? Or is this your AWS SES account?
The reason I ask is spam. As in, if others use your service to send a lot of spam, am I (and my lists) going to be affected by the inevitable spam ranking?
Aside from that, this looks good.
Not sure whether your research looked at MailJet at all, but I regularly send 100k emails per month for £50 per month.
Edit: I'm an idiot, I re-read it carefully and see that is says "your AWS SES account". But I'll leave my dumb question here so others who miss it see the answer.