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.
The only settings that you can make use of when changing the email notification's sender information is to change the sender information settings (but not the sender email address)
You can choose the sender name to the full name field, you can use the reply-to email as the email address field in your form. This way, when clicking the reply button, the target email shall put the email from the form submitter's email address.
These so far are the only information that you can use as identifier to know who made the submission.
If this is not what you mean, please let us know.