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.
Jotform does not support automated sending of emails. Mails are only sent on form submission immediately. You could make a custom "Thank you" page where you could redirect user. In that php page you could save user to your database, and then send him emails periodically by cron on your webserver.
You can look at our guide for enabling POST data on custom "Thank you" pages.