About the reCAPTCHA
A Google reCAPTCHA is a test used to determine if the person submitting the form is a real human, or an automated program (bot). While this technique is not 100% foolproof, it should cut down the spam you receive quite significantly. It is also an improvement over the traditional CAPTCHA, where users can sometimes have difficulty differentiating letters.
When reCAPTCHA identifies a spam response, the response will appear as an Invalid submission and will also be marked as spam. You will also have the opportunity to mark the submission as safe by clicking "Mark as not spam" in the response.
Enable the reCAPTCHA
To enable the reCAPTCHA on one of your forms, scroll to the bottom of the Processing page. Check the checkbox to add a reCAPTCHA to your form.
Errors with reCAPTCHA
In rare cases, an error might occur with Google's reCAPTCHA. If this is the case, our older CAPTCHA option will be automatically initiated. You and your users will not notice any difference, other than the old CAPTCHA taking the place of the new reCAPTCHA.