Rabbit Builds

<p>Rabbit Builds Anti-Spam Comment Shield is a fast, reliable anti-spam plugin for the <strong>default WordPress commenting system</strong>. It blocks automated bot submissions using layered validation, while keeping the experience clean for real visitors.</p>
<p>Developed and maintained by <a href="https://rabbitbuilds.com/" rel="nofollow ugc">Rabbit Builds</a> — visit our website to explore more WordPress tools and solutions.</p>
<h3>Important</h3>
<ul>
<li>Clear your page cache after activation or after changing plugin settings.</li>
<li>Works with the default WordPress comment form only (not AMP comment forms).</li>
</ul>
<h4>Features</h4>
<ul>
<li>🛡️ <strong>Hash-Based Verification</strong> — Blocks bots by hiding the comment form action URL</li>
<li>🍯 <strong>Honeypot Trap</strong> — Hidden field that catches bots filling every input</li>
<li>⏱️ <strong>Time-Based Check</strong> — Rejects comments submitted too quickly</li>
<li>🔒 <strong>REST API Protection</strong> — Blocks unauthenticated REST API comments (disable for headless setups)</li>
<li>📊 <strong>Spam Statistics Dashboard</strong> — Real-time total & daily blocked spam counter</li>
<li>⚙️ <strong>Modern Settings Page</strong> — Beautiful card-based UI with toggle switches</li>
<li>🔔 <strong>Admin Bar Counter</strong> — See blocked spam count in the admin bar</li>
<li>✏️ <strong>Custom Block Message</strong> — Personalize the blocked spam response</li>
<li>100% GDPR Compliant — No external requests, no cookies, no tracking</li>
<li>Captcha-Free — Completely invisible to your visitors</li>
<li>~200 bytes inline JavaScript — Zero performance impact</li>
<li>Compatible with all page caching and performance optimization plugins</li>
</ul>
<h4>How does it work?</h4>
<ol>
<li>The plugin removes the comment form action URL from raw HTML output.</li>
<li>When real user interaction is detected (scroll, mouse move, touch, or focus), JavaScript restores the action URL with a unique hash token.</li>
<li>On submit, the server validates the hash token, checks the honeypot field, and verifies submission timing.</li>
<li>If any check fails, the request is blocked with a 403 response before spam can reach your database.</li>
</ol>
<h3>License</h3>
<p>This plugin is licensed under <strong>GPL-2.0-or-later</strong>.<br />
You may use, modify, and redistribute it under the terms of the GNU General Public License.</p>


Rabbit Builds Anti-Spam Comment Shield

Advanced, lightweight, GDPR-compliant anti-spam protection for WordPress comments. No setup required.

dillilabs

<p>This plugin integrates with the Dilli Email Validation API (DEVA) to block fake or incorrectly formatted email addresses at form submission, ensuring higher-quality leads and significantly reducing spam.</p>
<p>This plugin requires an API Key which can be obtained for FREE by <a href="https://deva.dillilabs.com/register" rel="nofollow ugc">signing up here</a>. Learn more about Dilli Email Validation API <a href="https://www.dillilabs.com/products/email-validation-api/" rel="nofollow ugc">here</a>.</p>
<p>This plugin hooks directly into the WordPress core email validation function (<code>is_email()</code>), which is used by most major form plugins. That means it works out of the box with popular form builders like:</p>
<ul>
<li>Contact Form 7</li>
<li>WPForms</li>
<li>Gravity Forms</li>
<li>Ninja Forms</li>
<li>Jetpack/Grunion contact forms</li>
<li>WordPress registration forms</li>
<li>and many others.</li>
</ul>
<p>No need to modify your forms — just install and activate the plugin.</p>
<h4>Features</h4>
<ul>
<li>Validates email address format. Ex: email address <code>fooAtdillilabs.com</code> is invalid because of missing ‘@’</li>
<li>Checks for existence of MX records of the email address domain. Ex: <code>foobar@dlfkdlfkf.co</code> is invalid because no MX records exist for domain dlfkdlfkf.co.</li>
<li>Checks for Disposable/Temporary email addresses. Ex: user@mailinator.com is invalid because mailinator.com provides temporary shared temporary email inboxes.</li>
<li>Checks for conformity with ESP (Email Service Provider) grammar rules. Ex: <code>bob@yahoo.com</code> is invalid because Yahoo does not allow user part (<code>bob</code> in this case) to be less than 4 characters.</li>
<li>Checks for profanity in user part of email address. Ex: <code>f***you@gmail.com</code> is invalid.</li>
<li>Checks user and domain parts of an email address for known malicious patterns. Ex: <code>jondoe@gmail.com</code>, <code>foobar@yahoo.com</code>, <code>idontwanttogive@gmail.com</code> and <code>noemail@gmail.com</code> will be treated as invalid.</li>
<li>Checks email address domain against a known blacklist.</li>
<li>Checks email address against a known blacklist of frequently used email addresses for spam.</li>
<li>Checks for reserved domains. Ex: example.com is a reserved domain. Therefore, validemail@example.com is not allowed.</li>
<li>Checks for Role-based email addresses. Ex: info@someorganization.com will be treated as invalid.</li>
<li>Checks for safe domains. Restricts emails whose domains represents sites with adult content.</li>
<li>Checks for non-business email address.  Ex: *@gmail.com, *@yahoo.com, *@hotmail.com email addresses will be treated as invalid.</li>
<li>Checks the IP address of the user submitting the form against a known list of malicious IP addresses.</li>
<li>Add custom blocklist. You may request certain domains, emails and users to be blocked. </li>
</ul>
<h4>Available Languages</h4>
<ul>
<li>English</li>
<li>German (Deutsche)</li>
</ul>


Dilli Email Validator

Using the free 100 validation took 5 minutes having 10 logins only on my site.
Each login (not registration! login!!!) used 5 validations. I see no sense in validating logins (well, it makes sense for the provider asking 0.5 cents per validation). Even my admin user's (already logged in) ajax calls were validated each time.

And the worst is that it blocked valid users logging in with an email address from free email providers (not disposable).


BIG waste of money

Validates email addresses in real-time and blocks form submissions with invalid or fake emails. Reduce spam, fix typos, and capture quality leads.

Rabbit Builds Anti-Spam Comment Shield vs Dilli Email Validator