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.
Upon checking your form "Membership Application Form", I did not find any issue with the auto-responder email alert you have added. It should send the auto response emails without any issue.
Your form seems to have only 3 submissions out of which 2 is from October and only one was received on November 29, 2014. The reason why the auto response must have not been sent because the email address of the use is not valid. Please check the screenshot below:
The other two submissions were sent successfully. Please check the logs of your email history:[2014-10-30 11:39:03] Submission #290492743822829922 Form #43012884505148 SENT to firstname.lastname@example.org from email@example.com via AMAZONSES
[2014-10-29 23:02:31] Submission #290447351101701632 Form #43012884505148 SENT to firstname.lastname@example.org from email@example.com via AMAZONSES
It seems you have received several "Incomplete Payments" as well. If you want to send submission emails for the incomplete payments, you need to allow it. The following guide should help you: https://www.jotform.com/help/273-How-to-setup-Incomplete-Payment-Notification-E-mail
Hope this helps.
Do get back to us if you have any questions.