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.

emailable

Verify emails in real-time with Emailable.
Integrate with Emailable’s email verification API through this official plugin. Reduce spam and increase the quality of your signups by verifying emails directly from any form.
This is compatible with all major WordPress Forms and plugins that use the is_email function to validate email addresses. 
This includes, but is not limited to:
<ul>
<li>WordPress’s default registration and comment forms</li>
<li>WooCommerce’s registration and checkout form</li>
<li>Gravity Forms</li>
<li>Contact Form 7</li>
<li>Ninja Forms</li>
<li>Jetpack Forms</li>
</ul>
Emailable’s verification includes:
<ul>
<li>Disposable Email Detection</li>
<li>Accept-All Email Detection</li>
<li>MX Record Detection</li>
<li>SMTP Provider Details</li>
<li>Misspelled Domain Detection</li>
<li>Syntax Validation</li>
<li>Domain Validation</li>
<li>SMTP Verification</li>
<li>Email Deduplication</li>
<li>Role Email Detection</li>
<li>Free Email Detection</li>
<li>Email Quality Score</li>
<li>Anti-Greylisting Technology</li>
</ul>
To use this plugin, <a href="https://app.emailable.com/signup/" rel="nofollow ugc">sign up for a free Emailable account</a>, create an API key. All new signups will receive 250 free credits. 
What makes Emailable special?
<ul>
<li>Best in class performance: 30k emails verified per minute</li>
<li>Most Advanced Email Detection: Free, No Reply, Role, Accept-All, Disposable, and Mailbox Full</li>
<li><a href="https://emailable.com/guarantee/" rel="nofollow ugc">99%+ Deliverability Guarantee</a></li>
<li>99.99% Uptime</li>
<li>24/7 Support</li>
<li>SOC 2 Type II certified</li>
<li>GDPR, Privacy Shield, CCPA, and LGPD compliant</li>
</ul>
See more information about data privacy in the links below:
<ul>
<li><a href="https://emailable.com/terms-of-service/" rel="nofollow ugc">Emailable’s Terms of Service</a></li>
<li><a href="https://emailable.com/privacy-policy/" rel="nofollow ugc">Emailable’s Privacy Policy</a></li>
<li><a href="https://emailable.com/data-processing-agreement/" rel="nofollow ugc">Emailable’s Data Protection Agreement</a></li>
<li><a href="https://emailable.com/anti-spam-policy/" rel="nofollow ugc">Emailable’s Anti-Spam Policy</a></li>
</ul>

Emailable – Premium Email Verification & Validation

Verify emails in real-time with Emailable.

BillionVerify Email Validator vs Emailable – Premium Email Verification & Validation