Block or Delete spam user on Registration by email domain & username.

Blocks spammers sending contact forms using an email address from the domain of the WordPress installation in Contact Form 7.

Easily set a list of email domains to block on email fields in Gravity Forms.

Blocks registrations, WooCommerce checkouts, and comments that use disposable (throwaway) email addresses, with custom block and allow lists.

Add-on for Gravity Forms to create a Blacklisting of specific emails or domains for the Email input field to throw a validation error or mark as spam.