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.

WP24

WP24 Domain Check allows users to check domains if they are free for registration. The responsive form could be easily intregrated via shortcode or widget. Labels and colors are customizeable through the settings page.
Features
<ul>
<li>Easy integration via shortcode or widget</li>
<li>Ajax based search (no page reload required)</li>
<li>Define a list of testable TLDs</li>
<li>Drop-down list (select the TLD from predefinded list)</li>
<li>Free text input (type TLD into domain name field)</li>
<li>Over 1,500 supported TLDs</li>
<li>Possibility of checking every TLD</li>
<li>Internationalized domain name (IDN) support</li>
<li>Check all TLDs simultaneously (asynchronous)</li>
<li>Show detailed whois information (if domain is registered)</li>
<li>Provide price and purchase link for each TLD</li>
<li>WooCommerce integration</li>
<li>Responsive design</li>
<li>Bot protection with reCAPTCHA (version 2 and 3)</li>
<li>Customization of labels and colors</li>
<li>WPML and Polylang compatible</li>
</ul>

WP24 Domain Check


It only works with common TLDs like .com, .org or .net. It doesn't work with most other TLDs. For example, try .ng or something similar.


Does not work with most of the TLDs

Check (whois) domain names for availability. Easy integration via shortcode or widget.

Email Domain Checker for WP e-Commerce vs WP24 Domain Check