Disable any emails sent from your site as per the condition you set. Do not send emails if Receipent (To Email) is/is not/contains/do not contain something Email Subject is/is not/contains/do not contain something Email Message is/is not/contains/do not contain something and many other conditions.. Compatible with WordPress core emails such as New User Registration email, Plugin/Theme Automatic Updates Notification emails etc, WooCommerce emails such as New Order Email, Password Change Email etc. and with every WordPress plugins sending emails with wp_mail(). Follow the documentation for more information.