mx20.itfhosting.dk has no CNAME records.
Question and response
Question
dig mx20.itfhosting.dk. NS
Answer
The response has no answer records.
Authority
itfhosting.dk. 209 SOA ns1.curanet.dk. hostmaster.curanet.dk. 2026030201 14400 3600 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0