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.
We have made some changes and permanently disable Sending Email notification using Custom Email Address that is why (if you will check) the "Sender Email" section is not visible from the email notification settings.
Kindly check this thread
If you are having problems with your email, kindly let us know which email addresses so that we could take a look if it is in the bounce list and we will take an appropriate action to fix it.
Thank you for using JotForm.