To enable CAPTCHA verification, install the ASP.NET Web Helpers Library and uncomment ReCaptcha.GetHtml and replace 'PUBLIC_KEY' with your public key. At the top of this page, uncomment ReCaptcha.Validate and replace 'PRIVATE_KEY' with your private key, and also uncomment the captchaMessage variable.

Register for reCAPTCHA keys at reCAPTCHA.net.