A specific email or multiple emails keep spamming your surveys, how can you stop this?
Ex: Everyday email Fake@Fake.com keeps filling out our volunteer survey, leading to lots of useless survey information. How can you stop this?
You would want to enable CAPTCHA in your survey. CAPTCHA is a program that can tell whether the user is a human or a computer. CAPTCHAs are used by many websites to prevent/mitigate abuse from bots, or automated programs usually written to generate spam.