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.
If you're using Jotform's default sender emails e.g. firstname.lastname@example.org and email@example.com, the answer is no. They are sent unencrypted. If that's one of your major concern, then use your own SMTP to send secure emails instead. I believe this is done by setting SSL/TLS on your SMTP configuration to enable encryption for emails. Here's How-to-Setup-SMTP-for-a-Form.
Hope this helps!