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

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.

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