I really like this. I'm an engineer, and have had to build basic versions of this internally at a previous company, and we never managed the investment to make

I really like this. I'm an engineer, and have had to build basic versions of this internally at a previous company, and we never managed the investment to make it work nicely. This would have been a great option for us. We had an SQL database with all the data in it, and we used MJML for our emails. The only thing was that we had a fairly complex Sendgrid setup to ensure good deliverability at relatively large email scale. However. I don't think we'd have paid for this as a SaaS service. These sorts of tools could be engineering or marketing led. We had some marketing-led tools that were fairly hands-off from engineering, but they didn't connect to our database. We happily paid for these services. However this would have been engineering led, and we'd have wanted to self-host given how it worked. Just my 2c, but I'd either keep it engineering-targeted, open source it, and make money on support, or change tack a bit to target at the marketing folks. And a feature request: "linting" emails. We ended up with manual checklists for things like: do all the links resolve, do they have tracking tokens, is the plaintext preview good, is there an unsubscribe link. Linting for these would be a great productivity boost.