ethanpil

Install this plugin into any WordPress system with a working Gravity Forms plugin and all known disposable email address hosts will be rejected and fail validation. This only checks the field type “email” and does not require any configuration or special settings. Its global, if its turned on, then its working.
Thanks to adamloving for the initial list: https://gist.github.com/adamloving/4401361
This WordPress plugin is brought to you by <a href="https://www.angeleswebdesign.com" title="Los Angeles Web Design WordPress Experts" rel="nofollow ugc">Los Angeles Web Design</a>

Gravity Forms Reject Disposable Emails

Reject disposable email addresses in Gravity Forms email fields.

tompec

MailCheck.ai is now UserCheck.com
Please install the <a href="https://wordpress.org/plugins/usercheck/" rel="ugc">new version</a> of this plugin.
MailCheck.ai is a powerful WordPress plugin that 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>No API key needed</li>
<li>Caches results for improved performance</li>
<li>Seamlessly integrates with WordPress registration and comment forms</li>
</ul>
The plugin uses the API provided by <a href="https://www.mailcheck.ai" rel="nofollow ugc">MailCheck.ai</a>, which is constantly updated to include the latest disposable email domains. This ensures your site stays protected against new disposable email providers.
MailCheck.ai is free to use and starts working immediately after installation. No registration or configuration is required.

MailCheck.ai

This plugin works great!  The service works well, nothing is 100% and won't block all temp emails but it gets updated frequently and new domains are added all the time.  I would recommend this plugin for everyone who allows registration on their site.

Works Great!

No options, light weight and effective addition to combat spam and account creation. And to boot, it seems to work very well on Multisite too!

Simple and effective

Prevent disposable email addresses from registering or commenting on your site with MailCheck.ai.

Gravity Forms Reject Disposable Emails vs MailCheck.ai