Vishal Kothari

This plugin validates the existence of the domain name that is entered in the email address while checkout. This plugin strengthens your email validation by more than just the regular expression matching, thereby reducing chances of loosing an order due to incorrect email address & increasing accuracy of your data.
The checkout process cannot be completed till the email address is entered with the correct domain, thus eliminating any chances of a wrong email address (at least the domain can’t be wrong).
If the domain is not a valid domain, it will show an error and not allow the customer to checkout till the email address is entered with the correct domain.
Other free plugins for WP e-Commerce:
<ul>
<li><a href="https://wordpress.org/extend/plugins/viral-coupon-for-wp-e-commerce-lite" title="Viral Coupon Plugin" rel="ugc">Viral Coupon Lite for WP e-Commerce</a> – Social Media Promotion Tool for your store (Facebook)</li>
<li><a href="https://wordpress.org/extend/plugins/order-delivery-date" title="Order Delivery Date" rel="ugc">Order Delivery Date</a> – Allow customers to choose their order’s delivery date</li>
</ul>
Premium plugins for WP e-Commerce:
<ul>
<li><a href="http://codecanyon.net/item/viral-coupon-for-wp-ecommerce/2644621" title="Viral Coupon Pro" rel="nofollow ugc">Viral Coupon Pro</a> – Promotes your store on Twitter & Google+ in addition to Facebook.</li>
</ul>

Email Domain Checker for WP e-Commerce

This plugin validates the existence of the domain name that is entered in the email address while checkout for WP e-Commerce store owners.

asdqwe123

Ajax Domain Checker is a WordPress plugin which allow you easily to check domain name availability from your wordpress site. You can check or search for any generic top-level domains (gTLD) or country-code top-level domains (ccTLD). Ajax Domain Checker is made with AJAX and easily to use with Shortcode or Widget.
<h4>Features</h4>
<ul>
<li>Check domain name availability for any gTLD and ccTLD</li>
<li>Made with AJAX</li>
<li>Easily use with Shortcode</li>
<li>Easily use with Widget</li>
<li>Easily check from dashboard admin</li>
<li>No need domain reseller API</li>
</ul>
Shortcode: [ajaxdomainchecker]
<a href="https://asdqwe.net/wordpress-plugins/wp-domain-checker/" rel="nofollow ugc">Get PRO Version</a>
<h4>PRO Features</h4>
<ul>
<li>Check domain name availability for any gTLD and ccTLD</li>
<li>Whois domain name</li>
<li>Made with AJAX</li>
<li>Easily use with Shortcode</li>
<li>Easily use with Widget</li>
<li>Easily check from dashboard admin</li>
<li>Easily customize from admin panel</li>
<li>No need domain reseller API</li>
<li>Integrated with WHMCS</li>
<li>Integrated with WooCommerce</li>
<li>Support IDN Domain</li>
<li>Protected with New Google reCAPTCHA</li>
<li>Support more than 1000 TLDs</li>
<li>Domain Caches</li>
<li>Custom Whois Server</li>
<li>Support WHMCS Bridge & WHMPRESS</li>
<li>Transfer Button</li>
<li>Whois Domain Lookup Only</li>
<li>Whois IP Address Lookup</li>
</ul>

Ajax Domain Checker

In the latest WordPress version (5.4.2) and latest PHP (7.4) this plugin is showing loads of errors, as soon as it is activated.

Not working at all!

Ajax Domain Checker is a WordPress plugin which allow you easily to check domain name availability from your wordpress site.

Email Domain Checker for WP e-Commerce vs Ajax Domain Checker