Google provides a free service called reCAPTCHA, Completely Automated Public Turing test to tell Computers and Humans Apart. reCAPTCHA helps protect your website against spam and abuse and identify the difference between computers and humans. You can use this feature to protect your Signup Form from being abused by Spammers.
Before getting started with reCaptcha, please note that as of September 2018, many Google services were blocked in Mainland China. Due to these restrictions, reCAPTCHA may not work correctly if your visitors are in the China region. You can learn more about this by Clicking Here.
The reCAPTCHA feature can be located in the Small Embed, Embedded Form, and Popup signup forms. Please follow the steps below to turn on reCAPTCHA.
reCAPTCHA should look like this once it is enabled:
Click Here to learn how to create a Signup Form.