Ask HN: Can you help me find an old post?

I'll describe it to the best of my ability, as Google/Algolia etc are all failing me:

- It was a Sign Up button that I believe was a Jquery plugin, and when the signup button was pressed it would just send your (the site admin's) email address a note saying that the user had signed up and it contained the form fields

(The purpose being for people who are building prototypes/MVPs of their apps, so that they don't need to build a user auth system yet)