http://5ub5a23pmqnjtsbdbm6ursmojwvm3fnkhw6ielihgwonbtsmxw7scdid.onion/en/help/terms-service
To protect ourselves, our customers, and the quality of our service, we block TCP port 25 because of email spam and ports 137, 138, 139, and 445 due to a Microsoft security issue. We also hijack DNS requests (port 53) in order to prevent DNS leaks. We do not block or filter domains except when requested by the owner of an IP address or when known botnet addresses cause our servers to be null-routed by hosting providers.