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 understand that you want to send an email to the person who filled the form with a promo code. Is that correct? If so, you may add an auto-responder email to your JotForm so that an email shall be sent to the form filling person after submitting the form.
Please refer to the guide below that can help you in adding the auto-responder email to your JotForm:
While setting up the Auto-responder, you may edit the email to add your promo code to the body of the email.
Hope this information helps! If you are referring to something different or need any further assistance, please let us know. We will be happy to assist.