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.

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.

QuickEmailVerification vs Dilli Email Validator