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WordPress PluginBillionVerify 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.
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.
Enable the WordPress integrations you need in Settings → BillionVerify and the WordPress plugin hooks into those forms automatically.
Verify emails on the default WordPress registration form, including WordPress multisite signup.
Validate the email field on the native WordPress comment form to cut spam comments.
Check addresses on the WordPress lost-password form before reset emails are sent.
Verify emails on WooCommerce checkout and account registration on your WordPress store.
Add email verification to Contact Form 7, the most popular WordPress contact form plugin.
Validate email fields in WPForms, the drag-and-drop WordPress form builder plugin.
Block bad emails in Gravity Forms, a leading advanced WordPress forms plugin.
Verify emails in Elementor Pro form widgets across your WordPress pages.
Add real-time email verification to Fluent Forms on your WordPress website.
Get the WordPress email verification plugin running in three steps.
Upload the plugin to /wp-content/plugins or install it from the WordPress plugins screen, then activate it in WordPress.
Go to Settings → BillionVerify in your WordPress admin, paste your BillionVerify API key and click "Test connection".
Pick which WordPress forms to protect and which email statuses block a submission. Invalid is blocked by default.
The WordPress plugin verifies each email during form submission — no front-end changes to your WordPress site.
Identify valid, invalid, disposable, catch-all, role and risky addresses on any WordPress form.
Decide exactly which statuses your WordPress forms reject — invalid only by default, fully configurable.
Show your own message to WordPress visitors when an email is blocked by the plugin.
Run a connection test and a single-email test right inside the WordPress admin.
The WordPress plugin caches results so repeated addresses do not spend extra verification credits.
If the API is unreachable or credits run out, your WordPress forms keep working as normal.
The WordPress email verification plugin is free to install from WordPress.org — you only pay for verification credits.
Keep fake and mistyped emails out of your WordPress user base and mailing lists.
Removing undeliverable emails at the WordPress form protects your sender reputation.
Blocking disposable and role emails reduces spam registrations and spam comments on WordPress.
Capture deliverable customer emails at WooCommerce checkout on your WordPress store.
The WordPress plugin works through settings only — no changes to your WordPress theme or forms.
Caching and the never-charged unknown status keep your WordPress verification costs low.
Discover all our verification tools
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.
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.
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.
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.
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.
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.
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
View source on GitHub