Block invalid, disposable, and risky email addresses in real-time. Works with WordPress registration, comments, WooCommerce checkout, Contact Form 7, Gravity Forms, WPForms, Elementor Pro, Ninja Forms, and Fluent Forms.
Emails are verified via SMTP-level checks the moment a form is submitted. Invalid addresses are blocked before they enter your database.
If the API is unreachable, forms continue to work normally. Your site never breaks due to an API outage. Reliability first.
Detects common email typos like "gmial.com" and suggests corrections with a friendly "Did you mean...?" prompt before submission.
One plugin covers your entire WordPress site. Enable or disable each integration individually.
WordPress Registration
WordPress Comments
WooCommerce
Contact Form 7
Gravity Forms
WPForms
Elementor Pro
Ninja Forms
Fluent Forms
Fallback (is_email)
Install, configure, and protect your forms in under 5 minutes.
Upload the plugin via Plugins → Add New → Upload in your WordPress admin, or install directly from the WordPress Plugin Directory once approved.
Go to Settings → ClearBounce, paste your API key from your ClearBounce dashboard, and click Test Connection to verify it works.
Choose which email types to block: undeliverable, disposable, role-based, catch-all, or free providers. Enable or disable each form plugin integration individually.
Every email submitted through your enabled forms is verified in real-time. Invalid emails see a friendly error message. Valid emails pass through with zero friction. Check verification logs and statistics from the settings page.
Every email is verified through multiple layers of validation.
Undeliverable Emails
Mailboxes that don't exist, domains with no MX records, and addresses that will hard bounce.
Disposable Emails
Temporary addresses from services like Guerrilla Mail and Temp Mail that expire within hours.
Role-Based Emails
Generic addresses like info@, admin@, support@ that typically have low engagement and high complaint rates.
Catch-All Domains
Domains that accept mail to any address, making individual mailbox verification impossible.
Free Email Providers
Optionally block Gmail, Yahoo, Outlook and other free providers for B2B-only forms.
Typo Detection
Catches common misspellings like gmial.com, hotnail.com, yaho.com and suggests the correct domain.
Sign up at clearbounce.net to get your API key. New accounts include 100 free verification credits to get started.
Each email verification uses 1 credit. Results are cached (24 hours by default) so repeat submissions of the same email don't use additional credits.
With the default "fail open" setting, all emails are allowed through when the API is unreachable or credits are exhausted. Your forms will never break.
The API typically responds in 1-3 seconds. Results are cached so returning visitors experience no delay. Verification happens server-side during form submission with no impact on page load speed.
ClearBounce requires WordPress 5.6+ and PHP 7.4+. It has been tested up to WordPress 6.9.
Yes. All error messages are fully customizable from the Settings page. You can set different messages for undeliverable, disposable, risky, role-based, catch-all, and free provider emails.
Sign up for free, install the plugin, and start blocking invalid emails in minutes. No credit card required.
