Nice job offering something for free. I'm not as skeptical as some here; looks like you just wanted to build something useful for people and it's not going to cost too much to provide it. At the very least, it's a great project to have under your belt, with real customers, etc. Could help landing jobs, for sure!

I had to figure out how to handle my contact form on my static blog recently, and I decided to simply write a form handler with Go and deploy it on Google's Cloud Functions. It's free for now (and probably always will be considering the fact that I'll probably never receive more than ~10 form submissions per month anyways). The function takes awhile to spin up cold, but it doesn't matter too much. I like it because the code is simple and I "own" the service.

Curious to hear what other static site admins have decided to use for their forms.