I needed a contact form for several websites I had developed, and didn't want to go the third-party route. So, using the "HTML in a placeholder" feature of Web Designer I wrote some HTML code that works well, has a "Recaptcha wannabe" input field,and uses a .php file for input validation. The .php file also sends me an email with the collected contact information. If you want to see the sample code and the .php file, let me know and I will send it to you.
You can see (and try out) the form at
https://nresystems.com
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