WordPress PluginWordPress Email Verification Plugin
BillionVerify Email Validator is a free WordPress plugin that verifies email addresses in real time on every WordPress form. Install the WordPress plugin to block invalid, disposable, catch-all and role emails before they reach your WordPress database.
View source on GitHubWhat is the BillionVerify WordPress plugin?
The BillionVerify WordPress plugin is a real-time email verification plugin for WordPress that checks every email address as your WordPress forms are submitted. This WordPress email verification plugin stops fake, mistyped, disposable and undeliverable emails before they hit your WordPress site — no front-end changes and no theme edits required.
Built for WordPress, the plugin verifies each address against the BillionVerify API with syntax, MX and SMTP mailbox checks, then rejects the submission when the email matches a status you have chosen to block. Cleaner WordPress signups mean fewer bounces, less spam and healthier email campaigns from your WordPress site.
WordPress forms protected by the plugin
Enable the WordPress integrations you need in Settings → BillionVerify and the WordPress plugin hooks into those forms automatically.
WordPress Registration
Verify emails on the default WordPress registration form, including WordPress multisite signup.
WordPress Comments
Validate the email field on the native WordPress comment form to cut spam comments.
WordPress Lost Password
Check addresses on the WordPress lost-password form before reset emails are sent.
WooCommerce
Verify emails on WooCommerce checkout and account registration on your WordPress store.
Contact Form 7
Add email verification to Contact Form 7, the most popular WordPress contact form plugin.
WPForms
Validate email fields in WPForms, the drag-and-drop WordPress form builder plugin.
Gravity Forms
Block bad emails in Gravity Forms, a leading advanced WordPress forms plugin.
Elementor Pro Forms
Verify emails in Elementor Pro form widgets across your WordPress pages.
Fluent Forms
Add real-time email verification to Fluent Forms on your WordPress website.
How to set up the WordPress plugin
Get the WordPress email verification plugin running in three steps.
Install the WordPress plugin
Upload the plugin to /wp-content/plugins or install it from the WordPress plugins screen, then activate it in WordPress.
Add your API key
Go to Settings → BillionVerify in your WordPress admin, paste your BillionVerify API key and click "Test connection".
Choose forms and statuses
Pick which WordPress forms to protect and which email statuses block a submission. Invalid is blocked by default.
WordPress plugin features
Real-time WordPress verification
The WordPress plugin verifies each email during form submission — no front-end changes to your WordPress site.
Detects every email status
Identify valid, invalid, disposable, catch-all, role and risky addresses on any WordPress form.
Choose what blocks a submission
Decide exactly which statuses your WordPress forms reject — invalid only by default, fully configurable.
Custom error message
Show your own message to WordPress visitors when an email is blocked by the plugin.
Built-in test tools
Run a connection test and a single-email test right inside the WordPress admin.
Result caching
The WordPress plugin caches results so repeated addresses do not spend extra verification credits.
Fail-open by design
If the API is unreachable or credits run out, your WordPress forms keep working as normal.
Free WordPress plugin
The WordPress email verification plugin is free to install from WordPress.org — you only pay for verification credits.
Why add email verification to WordPress
Cleaner WordPress signups
Keep fake and mistyped emails out of your WordPress user base and mailing lists.
Fewer bounces
Removing undeliverable emails at the WordPress form protects your sender reputation.
Less spam
Blocking disposable and role emails reduces spam registrations and spam comments on WordPress.
Better WooCommerce data
Capture deliverable customer emails at WooCommerce checkout on your WordPress store.
No code, no theme edits
The WordPress plugin works through settings only — no changes to your WordPress theme or forms.
Credit-friendly
Caching and the never-charged unknown status keep your WordPress verification costs low.
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WordPress plugin FAQ
1. How does the WordPress email verification plugin work?
When a visitor submits a protected WordPress form, the plugin sends the email address to the BillionVerify API. If the address matches a status you chose to block (for example invalid or disposable), the WordPress form rejects the submission and asks for a different email. No email is sent to the address during verification.
2. What happens if my account runs out of credits?
By default the WordPress plugin fails open: if verification cannot be completed, the email is accepted and your WordPress forms keep working as if the plugin were not installed. You can switch this to fail closed in the plugin settings.
3. Does the plugin consume a credit on every submission?
Each unique address is verified once and cached for the lifetime you configure, so repeated submissions of the same address on your WordPress forms do not spend extra credits. The unknown status is never charged.
4. Do I need to modify my existing WordPress forms?
No. Enable the integrations you want in Settings → BillionVerify and the WordPress plugin hooks into those forms automatically — no changes to your WordPress theme or form markup.
5. Which WordPress forms does the plugin support?
The WordPress plugin supports the default WordPress registration, comment and lost-password forms, WooCommerce checkout and registration, Contact Form 7, WPForms, Gravity Forms, Elementor Pro Forms and Fluent Forms.
6. Is the WordPress plugin free?
Yes. The BillionVerify Email Validator WordPress plugin is free to download and install from WordPress.org. You only pay for the email verification credits you use through the BillionVerify API.
Add email verification to your WordPress site
Install the free BillionVerify WordPress plugin and start blocking bad emails on every WordPress form today.
Free WordPress plugin on WordPress.org · Works with 9+ WordPress form plugins · Real-time email verification · No theme or form edits