Check DNS

INTRODUCTION
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The Check DNS module simply prevents user registration with invalid email domain on user registration form.

It validates email domain before registration and checks if the domain exists. This prevents false registration.

INSTALLATION
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D7
* Install as you would normally install a contributed Drupal module. Visit:
https://drupal.org/documentation/install/modules-themes/modules-7
for further information.

D8
* Install as you would normally install a contributed Drupal module. Visit:
https://www.drupal.org/docs/8/extending-drupal-8/installing-drupal-8-mod...
for further information.