The Cross Domain Blocking feature is relevant only to users with more than one domain in their ClickCease account.
When this feature is enabled and the system detects a fraudulent activity made on one of your campaigns, that IP address will be added to the exclusion lists of all of his campaigns - including those in his other domains.
Note: Enabling Cross Domain Blocking on one domain will apply this feature for the rest of the domains on your account. Please consider if this when enabling this feature.
If you have any questions about this process, feel free to reach out to our 24/7 chat support.