UserCheck

<p>UserCheck prevents disposable or throwaway email addresses from registering or commenting on your site. This helps to protect your site from spam and maintain the quality of your user base.</p>
<h4>Key Features</h4>
<ul>
<li>Automatically checks email addresses against a constantly updated database of disposable email domains</li>
<li>Works out of the box with no configuration required</li>
<li>Seamlessly integrates with WordPress registration and comment forms</li>
</ul>
<p>The plugin uses the API provided by <a href="https://www.usercheck.com" rel="nofollow ugc">UserCheck</a>, which is constantly updated to include the latest disposable email domains. This ensures your site stays protected against new disposable email providers.</p>
<h3>Privacy Policy</h3>
<p>UserCheck sends email domains to the UserCheck API for validation. No personal data or full email addresses are transmitted. For more information on how UserCheck handles data, please visit <a href="https://www.usercheck.com/privacy" rel="nofollow ugc">https://www.usercheck.com/privacy</a>.</p>


Protect your WordPress site from disposable email addresses using the UserCheck API.

fixbounce

<p><strong>FixBounce Email Verifier</strong> checks if every email address on your site actually exists — not just if it looks valid, but if the mailbox is real. Install, activate, and you’re protected immediately. No account needed.</p>
<h4>How It Works</h4>
<p>Every email submitted on your site (registration, comment, contact form, checkout) is verified through the FixBounce API:</p>
<ol>
<li><strong>Syntax check</strong> — Is the email properly formatted?</li>
<li><strong>Disposable domain check</strong> — Is it a throwaway address? (350+ domains blocked)</li>
<li><strong>MX record check</strong> — Does the domain have a mail server?</li>
<li><strong>SMTP mailbox verification</strong> — Does the actual mailbox exist?</li>
<li><strong>Catch-all detection</strong> — Does the domain accept any address?</li>
<li><strong>Deliverability score</strong> — Deliverable, Risky, or Undeliverable</li>
</ol>
<p>All 6 checks run on every verification. The only difference between plans is how many verifications per day.</p>
<h4>Plans</h4>
<ul>
<li><strong>Trial (no signup)</strong> — 5 verifications/day. All features. Install and go.</li>
<li><strong>Free account</strong> — 10 verifications/day. Create a free account at <a href="https://fixbounce.com" rel="nofollow ugc">fixbounce.com</a> and add your API key.</li>
<li><strong>Pro ($29/mo)</strong> — 500 verifications/day + bulk user verification.</li>
</ul>
<h4>What Gets Protected</h4>
<ul>
<li><strong>Registration</strong> — Blocks signups with fake or non-existent emails</li>
<li><strong>Comments</strong> — Stops comments from disposable or invalid addresses</li>
<li><strong>Contact forms</strong> — Real-time validation on Contact Form 7, WPForms, Gravity Forms, Elementor, Ninja Forms, and any HTML form</li>
<li><strong>WooCommerce</strong> — Verifies billing email before order is placed</li>
</ul>
<h4>When the daily limit is reached</h4>
<p>Verification pauses until the next day. Forms, registrations, and comments work normally — they just skip the email check. A notice appears in the admin dashboard with upgrade options.</p>
<h4>Privacy</h4>
<p>Only the email address is sent to the FixBounce API for verification. No other user data is transmitted. See our <a href="https://fixbounce.com/privacy" rel="nofollow ugc">privacy policy</a>.</p>


FixBounce Email Verifier

Block fake, disposable, and non-existent emails via SMTP verification. 5 free verifications/day, no signup needed.

UserCheck vs FixBounce Email Verifier