I like the idea, it seems like there is a pretty large, mostly unexplored market there, but the thing that personally makes me pause as a potential customer is

I like the idea, it seems like there is a pretty large, mostly unexplored market there, but the thing that personally makes me pause as a potential customer is that I have no idea how to write those emails. If you could create a micro-course that illustrates what a mailing list should be like, or even bake some kind of "meta wizard" into your product, I'd be much more willing to sign up.