UserCheck

UserCheck 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.
<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>Seamlessly integrates with WordPress registration and comment forms</li>
</ul>
The plugin uses the API provided by <a href="https://www.usercheck.com" rel="nofollow ugc">UserCheck</a>, which is constantly updated to include the latest disposable email domains. This ensures your site stays protected against new disposable email providers.
<h3>Privacy Policy</h3>
UserCheck sends email domains to the UserCheck API for validation. No personal data or full email addresses are transmitted. 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>.

Protect your WordPress site from disposable email addresses using the UserCheck API.

IsTempMail

This plugin will verify every email address submitted by users. 
It’ll automatically detect and block disposable, temporary email addresses. 
It’ll give a nice warning message when users are signing up, logging in, 
or changing email to a temporary email.
The plugin checks the domain name using a service named 
<a href="https://www.istempmail.com/?ref=wp" rel="nofollow ugc">IsTempMail</a>. 
If a domain name is blocked, it will be stored into a local blacklist. 
You can also manage your own local whitelist and blacklist to allow or 
disallow certain domains.
The plugin integrates with the WordPress built-in function <code>is_email()</code>. 
It works seamlessly with other plugins including WooCommerce, 
Contact Form 7, Gravity Form, Jetpack/Grunion contact forms, Kadence Blocks Forms as well as 
other formbuilders and ecommerce plugins and WordPress’ own registration form.

Block Temporary Email

This plugin stops users from giving you disposable or fake email addresses when signing up. This helps reduce spam and fraud.

UserCheck vs Block Temporary Email