It's only a matter of time until someone open sources an editor like this or, probably more useful more most people, creates a service that embeds an email editor like this in your app.

It'll be interesting to see how much adoption it gets because I don't think it's the solution most people really want. IMO, something simpler like a Markdown / Bootstrap for email is the real solution -- something that takes a simpler syntax or simple HTML and compiles it into "email compatible" HTML.

The thing that really sucks about email design is that you are stuck with HTML circa the early 2000s. An abstraction layer that took care of those annoying details seems like the real way to go. Curious what others think.