What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
I'm assuming that you're asking for the purpose of the Reply-To Email field. The purpose of this setting is that whenever you receive an email alert, hitting the reply button on the email you received will be pointed to the email address set there.
Example: You receive an email from firstname.lastname@example.org, then on the Reply-To Email field, is the email address field on your form, clicking reply on the email you receive will be pointed to the email provided by the person who made a submission.
If you need further clarification on this matter, please do let us know.