ZBounce Email Validator
WordPress Plugin

This free plugin integrates your WordPress site with the ZBounce Email Engine Platform API for on-the-fly email verification.

It hooks into Contact Form 7, WooCommerce checkout, and WordPress registration forms to block invalid, disposable, or non-existent addresses before submission.

Key features include real-time syntax and SMTP checks, disposable-mail filtering, and catch-all detection.

When combined with CAPTCHA, it’s an ideal solution to stop brute-force bots and reduce spam registrations.

Simply download and unzip into wp-content/plugins/zbounce-email-validator, activate the plugin, and (optionally) enter your ZBounce API key under Settings → ZBounce Email Validator.