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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I assume that you are mentioning about the email that sends for your user (Autoresponder). You can easily add this function to your form by adding a "Autoresponder".
Below, you will find more information and steps to achieve this scenario:
If you have still more questions about this topic, please don't hesitate to contact us.