Ikbear

BillionVerify Email Validator checks email addresses in real time as your forms are submitted, stopping fake, mistyped, disposable and undeliverable emails before they reach your database. Cleaner signups mean fewer bounces, less spam and healthier email campaigns.
The plugin verifies each address against the BillionVerify API — performing syntax, MX and SMTP mailbox checks — and rejects the submission when the address matches a status you have chosen to block.
Key features
<ul>
<li>Real-time verification during form submission (no front-end changes required).</li>
<li>Detects valid, invalid, disposable, catch-all, role and risky addresses.</li>
<li>Choose exactly which statuses block a submission — invalid only by default.</li>
<li>Custom error message shown to visitors.</li>
<li>Built-in connection test and single-email test tool in the admin.</li>
<li>Result caching to save credits on repeated addresses.</li>
<li>Fail-open by default: if the API is unreachable or credits run out, forms keep working.</li>
</ul>
Supported forms
<ul>
<li>Default WordPress registration form (including multisite signup)</li>
<li>WordPress comment form</li>
<li>WordPress lost-password form</li>
<li>WooCommerce checkout and account registration</li>
<li>Contact Form 7</li>
<li>WPForms</li>
<li>Gravity Forms</li>
<li>Elementor Pro Forms</li>
<li>Fluent Forms</li>
</ul>
<h3>Third-Party Service Usage</h3>
This plugin sends email addresses to the BillionVerify API (https://billionverify.com/) for verification. Through API calls to BillionVerify servers it verifies email addresses and retrieves account credit information, using the following endpoints:
<ul>
<li>Verify an email address: https://api.billionverify.com/v1/verify/single</li>
<li>Retrieve credit balance: https://api.billionverify.com/v1/credits</li>
</ul>
By installing and activating this plugin, you consent to the transmission of submitted email addresses to these URLs for the purpose of verification. Use of the BillionVerify service is subject to BillionVerify’s Terms of Service (https://billionverify.com/terms) and Privacy Policy (https://billionverify.com/privacy).

BillionVerify Email Validator

Real-time email verification for your WordPress forms. Block invalid, disposable, catch-all and role addresses using the BillionVerify API.

Naqi

♣ Contact Form 7, Ninja Form, Gravity Form, Woocommerce Compatible
Verify Emails in Real-Time without sending any email at Contact Form 7, Ninja Form, Gravity Forms, Comments, Registrations, Woocommerce Orders, Subscribers. Kick SPAM & Verify for Real Valid Emails and detect Hard Bounced Emails. A complete validation tool of its kind. 
WP Email Verify is advance email validation rules that can detect only genuine and deliverable email addresses. We guarantee success rate of more than 97%. 
This plugin not only check syntax of email. It also checks for complete email verification so your website only accept leads from verified emails and visitors.
<a href="http://verify.hostandsoft.com" rel="nofollow ugc">DEMOS</a>
Why use WP Email Verify ? 
* Checks for Hard Bounced Emails 
* Real-time Validation 
* Syntax Chech, Domain Check 
* Ever lost lead due to client typo email address in your contact form 
* Got spam form submission from disposable emails 
* Spam comments in your comment section 
* And more…
Our plugin extends is_email() validation rule of wordpress plugin. So any other form plugin that uses this function works with our email checker.
It works with :
<ul>
<li>Contact Form 7 – UPDATED</li>
<li>Gravity Forms</li>
<li>Ninja Forms – UPDATED</li>
<li>WordPress Registration</li>
<li>WordPress Comments</li>
<li>Any many more which uses is_email wordpress function.</li>
</ul>
All the email checking is done in our dedicated server and you don’t need to worry about your IP getting blocked due to the check. We handle all this for you.
Please generate the API key (Free for Test, Premium) from <a href="https://verify.hostandsoft.com" rel="nofollow ugc">here</a>. API key is need to connect to our server for the email check.
For any issue, please visit our <a href="https://verify.hostandsoft.com/support.php" rel="nofollow ugc">dedicated support forum</a>.
Privacy Policy : We don’t store any email during the email check process. Only you API key details (Name, Email & Remaining Check Credits) are stored in our server.

WP Email Verify

Keep away SPAM comments,registration,ecommerce orders, WP Email Verify accepts email that really exisit this keep away bounced email

BillionVerify Email Validator vs WP Email Verify