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.
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How can I limit the same email from being used again?Asked by eventrunner on September 24, 2014 at 10:49 AM
I've created a form, where I ask for their email, how can I setup my form so that the people can't put in the samme email twice both over the samme form or over a new submission ?
I think you are possibly asking about how to prevent the same email from being used on your jotform?
If so then please see this guide about Adding a Unique Question.