No. You cannot add an entire domain to the Rejection Denylist, but you can use Rules to automatically reject emails sent to a certain domain.
Here's an example for rejecting all emails sent to recipients with @mandrill.com addresses:
No. You cannot add an entire domain to the Rejection Denylist, but you can use Rules to automatically reject emails sent to a certain domain.
Here's an example for rejecting all emails sent to recipients with @mandrill.com addresses: