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What you wanted is that one email per submission right? If a submitted email is used again it should show an error or warning message?
You can make a unique field for email by following the guide below.
1. Add the Email Field from the "Quick Tools", then navigate to "Setup & Embed"->"Preferences"
2. Click "Form Limits" then under the "Unique Question" option, choose a field that you would like to be unique per submission, in our case that would be the email field.
3. Close the settings and save the changes.
I hope this helps. Let us know if you needed more assistance on this.
That's exactly what I wanted Thankyou!
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