UserCheck

<p>UserCheck blocks disposable and throwaway email addresses from your sign-up forms. The result: less spam, fewer fake accounts, and a cleaner user base.</p>
<h4>Supported plugins</h4>
<p>If you’re using any of these, UserCheck protects them automatically — nothing to configure:</p>
<ul>
<li>WordPress core (registration, comments, multisite signup, profile email change)</li>
<li>WooCommerce (classic checkout, Cart/Checkout Block, account registration, Edit-account email change)</li>
<li>Profile Builder (free + Pro)</li>
<li>Contact Form 7</li>
<li>WPForms</li>
<li>Elementor Pro Forms</li>
<li>Gravity Forms</li>
<li>Fluent Forms</li>
<li>Ninja Forms</li>
<li>Formidable Forms</li>
<li>MailPoet</li>
</ul>
<h4>Fallback for unsupported plugins</h4>
<p>For plugins without a built-in integration, a fallback check catches sign-ups from any other form on your site. It only runs when someone submits a form, so it won’t slow down your dashboard or background tasks. You can turn it off under Settings <span aria-hidden="true" class="wp-exclude-emoji">→</span> UserCheck <span aria-hidden="true" class="wp-exclude-emoji">→</span> Coverage.</p>
<h4>Choose what to block</h4>
<p>Pick which kinds of email addresses get blocked: domains that can’t receive email, disposable addresses, public providers (Gmail, Yahoo, etc.), forwarding services that hide the real address, and known spammers. Domains on your UserCheck account blocklist are always blocked.</p>
<h4>Lightweight by design</h4>
<p>Emails are checked only when users submit a form (registration, comment, checkout) — never re-checked for existing users or orders. No background scans, no surprises.</p>
<h4>Resilient by design</h4>
<p>If our service is ever down or slow, your site keeps working: sign-ups go through and the error is logged for review. Each request times out after 2 seconds, so an unresponsive API can’t hold up your forms.</p>
<h4>Full email or domain only</h4>
<p>Send the full email (more accurate) or just the domain.</p>
<h4>Extensible</h4>
<p>Developers can plug UserCheck into any plugin’s validation hook by calling <code>UserCheck::instance()->evaluate_email( $email )</code> and acting on the returned <code>action</code>, <code>reason</code>, and <code>message</code>.</p>
<h4>Translation ready</h4>
<p>All text in the plugin can be translated into any language.</p>
<h4>Works out of the box</h4>
<p>No configuration required. A free API key unlocks higher request limits.</p>
<p>Powered by <a href="https://www.usercheck.com" rel="nofollow ugc">UserCheck</a>, which tracks new disposable email providers as they appear so your site’s protection stays current.</p>
<h3>Privacy Policy</h3>
<p>The plugin sends the email address (or just its domain, depending on your settings) to the UserCheck API for validation. The request User-Agent identifies the plugin version, WordPress version, site URL, and which integration triggered the check (e.g. <code>wp_registration</code>, <code>wc_checkout</code>, or <code>fallback_is_email/<plugin-slug></code> when the fallback fires for an unsupported plugin). No other end-user data is sent. 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>


Block disposable and throwaway email addresses on your WordPress site.

tompec

<p><strong>MailCheck.ai is now UserCheck.com</strong></p>
<p><strong>Please install the <a href="https://wordpress.org/plugins/usercheck/" rel="ugc">new version</a> of this plugin.</strong></p>
<p>MailCheck.ai is a powerful WordPress plugin that 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>No API key needed</li>
<li>Caches results for improved performance</li>
<li>Seamlessly integrates with WordPress registration and comment forms</li>
</ul>
<p>The plugin uses the API provided by <a href="https://www.mailcheck.ai" rel="nofollow ugc">MailCheck.ai</a>, which is constantly updated to include the latest disposable email domains. This ensures your site stays protected against new disposable email providers.</p>
<p>MailCheck.ai is free to use and starts working immediately after installation. No registration or configuration is required.</p>


MailCheck.ai

This plugin works great!  The service works well, nothing is 100% and won't block all temp emails but it gets updated frequently and new domains are added all the time.  I would recommend this plugin for everyone who allows registration on their site.

Works Great!

No options, light weight and effective addition to combat spam and account creation. And to boot, it seems to work very well on Multisite too!

Simple and effective

Prevent disposable email addresses from registering or commenting on your site with MailCheck.ai.

UserCheck vs MailCheck.ai