b4ecommerce

A lightweight plugin that checks for the most common email typos in the customer’s email and provides them with a warning. Using this plugin your customers will be much more likely to enter a valid email address, which will simplify and improve your order management.
USAGE 
You don’t need to configure the plugin, just upload and activate it and it’s ready to go.
CURRENTLY CHECKING FOR THE FOLLOWING EMAIL DOMAINS
<ul>
<li>Gmail</li>
<li>Hotmail</li>
<li>Outlook</li>
<li>Protonmail</li>
<li>Yahoo</li>
</ul>

Checkout email validation for WooCommerce

A lightweight plugin that checks for the most common email typos in the customer's email and provides them with a warning.

Antideo

The email validator is designed by Antideo to help combat spam coming in through contact forms. Antideo <a href="https://www.antideo.com/email-validation/" rel="nofollow ugc">validates email addresses</a> entered through your contact forms in real time to prevent inquiries from fake email addresses. The email validator plugin comes packed with several features that help you –
<ul>
<li>Check the syntax of the email entered, to quickly flag the error to the visitor</li>
<li>Check for disposable or temporary emails</li>
<li>Prevent inquiries from free ESP’s like Gmail, Yahoo, etc (Can be switched on and off)</li>
<li>Prevent inquiries from role-based emails like info@, support@, admin@ etc (Can be switched on and off)</li>
<li>Check MX records to identify invalid emails</li>
<li>Create and maintain your own local whitelist of domains and emails </li>
<li>Create and maintain your own local blacklist of domains and emails</li>
</ul>
Armed with the capabilities of our plugin you would be able to eliminate a major portion of contact form spam, as spammers seldom use a valid business email address. Our plugin out of the box is compatible with major forms like
<ul>
<li>Contact Form 7</li>
<li>Gravity Forms</li>
<li>Mailster Form</li>
<li>WooCommerce</li>
<li>MailChimp</li>
<li>Ninja Forms</li>
<li>Formidable forms</li>
<li>JetPack comments and a contact form</li>
<li>MailPoet</li>
<li>WP-Members</li>
<li>Paid Membership Pro</li>
<li>Form Maker by 10Web</li>
<li>Visual Form Builder 
And pretty much any other form that uses the default WordPress is_email() function. The plugin is very easy to install and activate, no tech knowledge whatsoever is needed to get going with the plugin.</li>
</ul>
Advantages of our plugin
<ul>
<li>No limits on the number of validations – go crazy, it’s unlimited!!</li>
<li>Real time validations done in a fraction of a second</li>
<li>Extensive database of 84K+ disposable email domains and constantly being updated with newer ones</li>
<li>Clean and super friendly UI that is easy to use</li>
<li>A powerful free version and an affordable premium version </li>
</ul>
We are literally eating our own dog food, implementing the <a href="https://www.antideo.com/wordpress-email-validation-plugin/" rel="nofollow ugc">Antideo Email Validation plugin</a> on several websites that we own, which has resulted in spam inquiries going down by over 87%.
You can access more information on the plugin as well as the several aspects of email validation <a href="https://www.antideo.com/blog/" rel="nofollow ugc">here</a>.
Disclaimer: This plugin is an email validator and not an email verifier

Antideo Email Validator

Form email validation, Email Blacklist, Domain Blacklist, Form email check, Real time email validator Requires at least: 4.7 Tested up to: 6.9.

Checkout email validation for WooCommerce vs Antideo Email Validator