JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Yes, you can send POST data from JotForm by using PHP in custom Thank You page. Basically, it will be posted to the page that you set up as your custom Thank You page.
Similarly, you can also send Submissions to your MySQL Database using PHP.
I hope this helps. Please let us know if you need further assistance in setting it up, and we will be happy to help.