To enable this feature, create or edit a giveaway. Under the Basic Information tab, you’ll see an option that says Block high risk email address TLD’s from entering.
Enabling this feature will block all emails with high risk TLD names from entering your contest. Currently, this list includes .ru, .ua, and .cn emails.
Disabling this feature allow email addresses from these TLD’s to enter. * It will still perform basic fraud detection.