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.

SoftCreatR

This wordpress plugin utilizes our daily dump of disposable email address domains to detect the use of disposable email addresses.
It uses the WordPress internal <a href="https://developer.wordpress.org/reference/hooks/is_email/" rel="nofollow ugc">is_email</a> hook, therefore it integrates seamlessly into 3rd party plugins like WooCommerce, Gravity Forms, Jetpack and every other plugin that uses the <a href="https://developer.wordpress.org/reference/functions/is_email/" rel="nofollow ugc">is_email()</a> function.
This plugin follows the “Privacy by design” principles by not sharing any personal informations of your users with 3rd parties. By installing/activating this plugin, you agree, that you’ve read and understood our <a href="https://www.dead-letter.email/privacy-policy" rel="nofollow ugc">privacy policy</a>.

Dead-Letter

Dead-Letter.Email for Wordpress. Dead simple disposable email check that just works.

Gravity Forms Reject Disposable Emails vs Dead-Letter