NoParam

<p>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.</p>
<h3>Features</h3>
<ul>
<li><strong>Real-time email validation</strong> – Ensures only valid, legitimate emails are submitted.  </li>
<li><strong>Smart Email Suggestions</strong> – Detects and suggests corrections for common typos (e.g., “gmal.com” <span aria-hidden="true" class="wp-exclude-emoji">→</span> “gmail.com”).  </li>
<li><strong>Spam Prevention & Fake Email Blocking</strong>: Safeguards your site from disposable, role-based, or temporary emails.</li>
<li><strong>Improves Email Deliverability</strong>: Helps protect your sender reputation and ensures higher inbox placement.</li>
<li><strong>Privacy-focused</strong>: No tracking, no storing, no reselling  </li>
<li><strong>Easy API integration for developers</strong></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>
<p><strong><a href="https://noparam.com" rel="nofollow ugc">Get your API key for Free</a></strong></p>
<h3>External services</h3>
<p>This plugin connects to NoParam’s email validation API to check the validity of email addresses submitted through forms.</p>
<p>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.</p>
<ul>
<li><strong>Service Used:</strong> NoParam Email Validation API – <a href="https://noparam.com" rel="nofollow ugc">Free Email Checker</a></li>
<li><strong>Data Sent:</strong> The plugin sends email addresses entered in form fields to the NoParam API for validation.  </li>
<li><strong>Why:</strong> This is required to determine whether an email address is valid, invalid, or risky.  </li>
<li><strong>When:</strong> This occurs when users submit forms that are configured to use the validation service.  </li>
<li><strong>Privacy & Terms:</strong>
<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><strong>Documentation:</strong>
<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.

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.

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