higherfield

Kaigai Spam Mail Blocker is a WordPress plugin that automatically detects and blocks spam or abusive contact form submissions, especially those originating from overseas.
The plugin analyzes submitted content and blocks messages that do not contain Japanese characters or consist primarily of alphanumeric characters, which are common patterns in spam messages.
Supported form plugins:
<ul>
<li>Contact Form 7</li>
<li>Elementor Pro Forms</li>
</ul>
No configuration is required. Simply install and activate the plugin.

Kaigai Spam Mail Blocker

Blocks spam submissions from overseas contact forms. Supports Contact Form 7 and Elementor Pro Forms.

Sajjad Hossain Sagor

Block Spammy Disposable/Temporary Emails To Increase Your Conversion & Filter Out Spam Emails.
<h4>Features:</h4>
<ul>
<li>No Complicated Settings, Just Plug & Play</li>
<li>Enable Filtering for Specific Forms</li>
<li>Fully Translation Ready</li>
<li>Customize Messages for Disposable/Temporary Email Alerts</li>
</ul>
Use this plugin to block/prevent disposable emails like 10MinuteMail and GuerrillaMail from submission on any contact form 7 form. Filter our your email listing to keep only real subscribers or users.
Credits 
– https://github.com/andreis/disposable

Disposable Email Blocker – Contact Form 7

Now You Can Easily Block/Prevent Disposable/Temporary Spam Emails From Submitting on CF7 Form.

Kaigai Spam Mail Blocker vs Disposable Email Blocker – Contact Form 7