I kind of love the Gatsby and Netlify combo. It was so simple to throw the two together and start my MVP sign up page.
I initially bought a theme from Theme Forest, but realized it's a pain to break apart into a Gatsby site. There's an 1800 line CSS file that won't compile in Gatsby.
I plan to integrate with MailChimp. I haven't decided whether I should use their interface for creating the newsletter or find some way to roll components out to emails.
My next step is to join a co-working space so I can meet other entrepreneurs and use their mailing address for Anti Spam compliance.