o2.email.arnsbomedia.com has no CNAME records.
Question and response
Question
dig o2.email.arnsbomedia.com. NS
Answer
The response has no answer records.
Authority
arnsbomedia.com. 226 SOA ns1.wannafind.dk. hostmaster.wannafind.dk. 2020110900 14400 3600 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0