[PinkPigeon]

Yeah POST requests with any sort of advanced functionality will always require some kind of server.

I built a thing that makes static sites, including form handling. BUT, the form handling, inevitably, requires a POST request back to a form-forwarding server that then sends you the enquiry via email (https://pinkpigeon.co.uk). Netlify include form handling for static sites, but it's so pricey that that was one of the main motivators for me to build my own solution.

I am not sure what the best implementation for this would be. Some people may go down the AWS Lambda route or something similar, but that's still just a (albeit highly distributed) server forwarding the request for you.