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 checked your "Notification" settings and the related email address. On the mail log, it seems that the most recent submission sent without having any issue. Below, you can check it:
In this case, I suggest you to check your Spam, Junk, Promotion etc. folders and also, check if there are any spam filters on your email program or email client.
Alternatively, you can use the SMTP method to send your emails with using your server, so you can beat that problem completely.
To do that, please follow the instructions from How to Setup SMTP for a form page.
If the problem insists, please do let us know.