Blacklist an e-mail address/domain in IronPort

Steps to Blacklist an e-mail address/Domain in IronPort

1. Log into  IronPort ESA instances
2. Go to Mail Policies -> Incoming Mail Policies.
3. Change Mode to Hosted Cluster.
4. Click on the Blacklisted Senders Policy.
5. Add sender email addresses or domains, then save and then commit changes.