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BigAlanAsked on April 16, 2019 at 5:32 PM
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jherwinReplied on April 16, 2019 at 8:43 PM
You can limit the form to one email per entry or submission, here's a guide for that.
Guide: How-to-set-Form-Limits-Based-on-a-Unique-Question
Please note that when the email is already registered or already in your submission page then the user with that email will not be able to submit the form again.