I've been trying to find an answer to as per title. How can I block a specific email address domain from being able to submit Drupal webform?
Webform has fields:
Name, Email address, Subject, Query - all fields are set to required.
What I want is a webform submission to be blocked when a visitor is trying to submit it using a specific email address domain, for example *@example.com.
I need my Drupal webform to be able to act similarly to a registration form equipped with User restrictions module.
Many thanks in advance.