How to Protect Your Forms Against Spam and Invalid Submissions

Form Protection Against Spam and Invalid Submissions

To ensure the quality of the data collected and minimize spam submissions through your forms, Closum offers the possibility of integrating additional security measures. Although Closum does not have native features such as email verification via confirmation link or reCAPTCHA directly within the form settings, these protections can be implemented using custom code.

Security Implementation with Custom Code

The most effective way to add advanced validations, such as reCAPTCHA, is through the Custom Code section of your Landing Pages. This approach allows you to incorporate external scripts that verify submissions before they are processed.

General Steps to Implement reCAPTCHA or Similar Validations:

1. Obtain the API Keys: Register your landing page with a reCAPTCHA service (such as Google reCAPTCHA) to obtain your public and secret keys.
2. Add the JavaScript Code: In your Closum landing page, go to the Custom Code options. Add the JavaScript provided by the reCAPTCHA service to render the widget on your form.
3. Integrate Verification on the Backend (Optional, for Enhanced Security): For stronger protection, it may be necessary to configure an endpoint on your backend that receives the reCAPTCHA response (usually a token) and validates it using your secret key. This prevents submissions from being made programmatically without user interaction.
4. Configure the Form: Make sure your form is configured to submit the reCAPTCHA response along with the other lead data.

Additional Considerations

• WordPress Integration: If you are using WordPress forms integrated with Closum, the validation logic may need to be handled on the WordPress side, before the data is sent to Closum.
• Plan Limitations: The ability to add custom code is available on all plans, including during the trial period. The choice of plan may affect other marketing automation features, but the ability to add custom code is available across all plans.

By implementing these measures, you can significantly reduce the volume of unintended traffic and ensure that the leads reaching you are more qualified.

Updated on: 11/08/2026