Anyone that's touched HTML emails can probably agree how fustrating and inconsistent the language can be across email clients.
Aside.. it's also a fidly language that can be difficult to debug with its own syntacical naunces new commers often miss. Sounds like a plan for disaster right?
In my first year at Freelancer I specialised in designing and building emails for our Acquistion team - it was my bread and butter. Eventually I wanted more automation and less dependancy in my work so I decided to create an email builder that would build the emails using a simple GUI.
Jokingly I called it Sampaign Monitor, inspired by the amazing Campaign Monitor.