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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Since you know express, you can use the nodemailer library to actually send the email. Since you are using React, you can use React-Email to actually design the email templates. It has built in support for nodemailer. But this is not needed if you will just be sending simple emails.
maybe use Bespoke. Self host it maybe, u'll learn a few things on how to do backend stuff. Insert the signup-form code to your site and collect those emails. It will show up in the app.