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, in case anybody finds it useful. The (still very basic) github repository is here:
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,