I have a contact form that is getting hate mail sent to it. Is there a way or add-on to validate if an email address is real before sending an email? We are having a person put their email as no@no.com which obviously isn’t real. Thanks!
The One-Time Password plugin should do the trick.
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If you’re still looking, we released a plugin since you posted that handles email validation for Gravity Forms. We call it… 
… GP Email Validator!
It will check if emails are the real deal, and you can verify if they’re from a disposable service, free email providers, from specific domains, etc. You can then block or allow based on your own criteria.