Stop fake signups and bounces before they reach your database. One plugin. Zero coding.
Block invalid emails on any CF7 form with one checkbox in settings
Add email validation as a native Gravity Forms rule — no code
Verify buyer email at checkout. Fewer failed deliveries, better LTV
Verify before subscriber is added to your Mailchimp audience
Widget-level validation with custom error messages
Block Guerrilla Mail, Temp Mail, Mailinator and 3,000+ others
Free plan: 100 verifications/month. No card required.
WordPress sites running WooCommerce stores, SaaS trial registrations, or gated lead-magnet forms are constant targets for automated bot registrations, free-trial coupon abuse using Gmail +aliases, and typo-ridden checkout emails that prevent order confirmations from arriving.
Integrating KaijuVerifier into WordPress takes less than 3 minutes via our lightweight PHP filter snippet or webhook action for Contact Form 7, WPForms, Gravity Forms, Elementor Pro Forms, Ninja Forms, and WooCommerce Checkout. When a user submits their email, WordPress queries /api/v1/verify-single in ~180ms: if the address is a disposable burner (Yopmail, 10minutemail), a dead mailbox, or a domain typo (e.g., @gmial.com), the form displays an inline correction prompt before the database row is created.
| WordPress Hook / Form Builder | Verification Trigger Event | Prevented Abuse & Revenue Impact |
|---|---|---|
| WooCommerce Checkout (woocommerce_after_checkout_validation) | Pre-payment billing email check | Prevents lost order receipts & catches @gmial.com/@hotmial.com typos |
| Elementor, WPForms, CF7 & Gravity Forms | Synchronous AJAX form validation hook | Blocks 112,000+ disposable domains from downloading lead magnets |
| Core WP Registration (registration_errors) | New user / membership signup guard | Stops bot spam accounts & duplicate Gmail +tag trial abuse |
Our WordPress integration hooks natively into Contact Form 7, WPForms, Gravity Forms, Elementor Forms, Ninja Forms, WooCommerce Checkout, and standard wp_registration_errors hooks.
When a visitor submits a form, the hook queries /api/v1/verify-single in ~180ms and blocks disposable burner domains (10minutemail, Yopmail), Gmail +aliases, and dead mailboxes with a friendly inline error message.