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This plugin prevents people from registering with disposable email addresses (dea) like the ones provided by mailinator (also known as throw-away email, one-time email). It protects your most important asset, your registered user base, by preventing contamination by fake accounts. This plugin working principle is similar to spam blacklists.
It hooks in the wordpress function is_email() so it will extend the known email validation of wordpress to detect dea domains.
The plugin itself does not contain a list of domains to block. Instead of local maintenance the plugin uses the service of http://www.block-disposable-email.com. This is a very accurate free service for up to 200 queries a month. For huge sites several commercial plans are available.
Please see the FAQ section for some more information.

Block Disposable Email

This plugin detects one-time email addresses (disposable email, trashmail, mailinator, 10minutemail) and helps to keep your userbase and comments clea …

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.

Block Disposable Email vs Block Temporary Email