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.

quickemailverification

<p>An email verification plugin by <a href="http://quickemailverification.com" rel="nofollow ugc">QuickEmailVerification</a> enables you to validate and verify the email address existence in real time, before you actually send them an email. Its unique email verification system is composed of multiple different validations starting from syntax checking to the end users’ mailbox existence checking. It not only detects invalid email addresses but also detects many other types of poor email addresses which could negatively impact the email deliverability and harm your sender reputation.</p>
<p>This plugin need a QuickEmailVerification API key to verify. You can get it from <a href="https://quickemailverification.com/apisettings" title="Get your API key" rel="nofollow ugc">API settings</a> page of QuickEmailVerification service.</p>
<h4>Key features</h4>
<ul>
<li>Email address syntax checking</li>
<li>Domain/MX records checking</li>
<li>Role address detection</li>
<li>Disposable email address (DEA) detection</li>
<li>Free email service detection</li>
<li>Typo detection and suggestion</li>
<li>Accept all email checking</li>
<li>Mailbox existence checking</li>
</ul>
<h4>Supported form Plugins</h4>
<ul>
<li>Contact Form 7</li>
<li>Formidable forms</li>
<li>Ninja forms</li>
<li>WooCommerce</li>
<li>WPForms</li>
<li>Profile Builder</li>
<li>Contact Form by BestWebSoft</li>
<li>Ultimate Member registration form</li>
<li>Fluent Forms</li>
<li>WPEverest forms</li>
<li>MailPoet</li>
<li>Theme My Login</li>
<li>WP-Members</li>
<li>Visual Form Builder</li>
<li>PlanSo forms</li>
<li>Buddypress registration form</li>
<li>Any other form which uses the is_email() function</li>
</ul>
<p>This plugin works either with “is_email()” function or with any other supported form plugins. So if any supported form plugin is enabled, “is_email()” hook will automatically be disabled.</p>
<p>To know more about email verification results, please have a look at the <a href="http://docs.quickemailverification.com/getting-started/understanding-email-verification-result" rel="nofollow ugc">QuickEmailVerification knowledge base</a>.</p>


QuickEmailVerification

The QuickEmailVerification email verification plugin to avoid fake, bad and nonexistent emails.

UserCheck vs QuickEmailVerification