x.tornado.email has no CNAME records.
Question and response
Question
dig x.tornado.email. NS
Answer
The response has no answer records.
Authority
tornado.email. 300 SOA ns.syse.no. hostmaster.syse.no. 7652 10800 1800 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0