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.

NoParam

NoParam Email Validation & Anti-Spam Prevention is a powerful plugin designed to ensure that your website’s email list is clean, legitimate, and free from spam. By integrating advanced email verification technology and spam prevention features, this plugin helps you protect your email sender reputation, improve deliverability, and engage with real users. Keep your site free of fake or disposable email addresses and safeguard your communications from spam and invalid sign-ups.
<h3>Features</h3>
<ul>
<li>Real-time email validation – Ensures only valid, legitimate emails are submitted. </li>
<li>Smart Email Suggestions – Detects and suggests corrections for common typos (e.g., “gmal.com” → “gmail.com”). </li>
<li>Spam Prevention & Fake Email Blocking: Safeguards your site from disposable, role-based, or temporary emails.</li>
<li>Improves Email Deliverability: Helps protect your sender reputation and ensures higher inbox placement.</li>
<li>Privacy-focused: No tracking, no storing, no reselling </li>
<li>Easy API integration for developers</li>
</ul>
<h3>Supported Forms</h3>
<ul>
<li>Contact Form 7 </li>
<li>WPForms </li>
<li>WordPress Registration Page </li>
<li>WordPress Post Comments </li>
<li>More integrations coming soon!</li>
</ul>
<a href="https://noparam.com" rel="nofollow ugc">Get your API key for Free</a>
<h3>External services</h3>
This plugin connects to NoParam’s email validation API to check the validity of email addresses submitted through forms.
NoParam’s Email Validation API uses advanced algorithms to detect fake, disposable, and temporary emails, ensuring the highest level of accuracy and reducing the chances of spam or bounce-back emails.
<ul>
<li>Service Used: NoParam Email Validation API – <a href="https://noparam.com" rel="nofollow ugc">Free Email Checker</a></li>
<li>Data Sent: The plugin sends email addresses entered in form fields to the NoParam API for validation. </li>
<li>Why: This is required to determine whether an email address is valid, invalid, or risky. </li>
<li>When: This occurs when users submit forms that are configured to use the validation service. </li>
<li>Privacy & Terms:
<ul>
<li><a href="https://noparam.com/privacy" rel="nofollow ugc">Privacy Policy</a> </li>
<li><a href="https://noparam.com/terms" rel="nofollow ugc">Terms of Service</a> </li>
</ul>
</li>
<li>Documentation:
<ul>
<li><a href="https://docs.noparam.com" rel="nofollow ugc">API Docs</a></li>
</ul>
</li>
</ul>

NoParam Email Validation – Email Verification & Anti-Spam Prevention

NoParam offers real-time email validation for WordPress to prevent fake signups and spam, improving email deliverability.

BillionVerify Email Validator vs NoParam Email Validation – Email Verification & Anti-Spam Prevention