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

Using This Plugin You Can Block Spammy Disposable & Temporary Email Domains From Submit On WPForms form. Filtering Spammy Emails Will Keep Your Subscriber List Spam Free.
<h4>Features:</h4>
<ul>
<li>Designed As Plug & Play So That Anyone Can Use</li>
<li>Toggle Feature To Enable/Disable Blocking on Individual Form</li>
<li>Translation Ready</li>
<li>Easily Change Disposable/Temporary Emails Found Error Message (Default Message Provided)</li>
</ul>
Are You Getting Spam Disposable or Temporary Emails Submission On Your Free Stuff Away Campaign which is not much valuable? You can use this plugin to block/prevent disposable emails like 10MinuteMail and GuerrillaMail from submission on any WPForms form.
Credits 
– https://github.com/andreis/disposable

Disposable Email Blocker – WPForms

Prevent Submitting Spammy Disposable/Temporary Emails On WPForms Contact Form.

Kaigai Spam Mail Blocker vs Disposable Email Blocker – WPForms