I've posted a few times here about Maildown, a startup that I've been trying to validate lately.

Due to lack of time to focus on this, I've taken the decision to abandon the project as a startup, but to make it available as an open source solution instead. The (still very basic) github repository is here:

https://github.com/chris104957/maildown

Maildown now exists as a simple CLI wrapper for Amazon SES which bakes in Markdown and styling support, making it much easier to get transactional mails up and running in any project

Thanks for looking,

Chris