domainabuse@tucows.com, apac-domain.manager@endurance.com, ipadmin@websitewelcome.com, qkhldjwp@whoisprivacyprotect.com, ipadmin@publicdomainregistry.com, abuse@publicdomainregistry.com, cpanel@webhostbox.net
Typically a registry will just fwd it on to the registrar. That said, registrars tend to take complaints from the registry more seriously imo.