Prevent spam form submissions

When a visitor enters their email address into the default email field on a HubSpot form, it is automatically validated by HubSpot. If the email address is not valid, the form will not submit. For example, if the address does not exist or is misspelled.

You can provide additional protection against spam form submissions by enabling CAPTCHA on your form or blocking specific email domains and free email providers.

Enable CAPTCHA

Enabling CAPTCHA adds a step to your form verifying that a visitor is not a robot, before they can submit the form. To enable CAPTCHA on a form:

• Hover over a form and click Edit. 
• In the left pane, under the Other Form Elements section, click to toggle the Captcha (SPAM Prevention) switch on.
• In the top right, click Update or Publish. After enabling CAPTCHA, Google's invisible reCAPTCHA will appear on your form when you add the form to a page. If Google determines that a visitor is suspicious, they must solve a CAPTCHA challenge before they can submit the form.
  
  

Block specific email domains or free email providers 

If you have a Marketing Hub Starter, Professional, or Enterprise subscription, you can block specific email domains or free email providers to encourage your visitors to provide high-quality business email addresses. These settings are configured on an individual form level and can be used on both forms and pop-up forms.