For others looking for a self-hosted alternative like Formspree I wrote something similar that deploys to AWS Lambda [0]. Nothing fancy, just a AWS Lambda endpoint that uses SES to send emails. Instead of aliasing email addresses for privacy like OP I just use the native Node.js crypto module to create a hex string of the address upfront.

[0] https://github.com/danielireson/formplug-serverless

I do this for a site I manage and it was remarkably easy to set up. I would recommend this for people who have familiarity with AWS, but not as a first introduction to AWS.

Why do these apps keep getting upvoted and created? Formspree has been around a long time, I don't understand it :P

I was offering a cors sevice with a rest api to sql database, authentication, email signup, and captcha, tools to build everything for static sites. Zero interest for it.

These things sound great but no one really uses them in practice.

Could be the wrong take away.

People seem to implement this sort of capability themselves a lot. So there is going to be a small marginal value to a 'canned' version, web sites are also particularly careful with emails and other PII people send them so a service approach runs the risk of the service harvesting that data and reselling it without the web site owners knowledge or approval. And finally, I expect a quick crawl of the web would turn up a zillion different 'tweaks' that individual sites make for their particular application, so it would be hard for them to use a pre-baked one.