exchange.hojmark.dk has no CNAME records.
Question and response
Question
dig exchange.hojmark.dk. NS
Answer
The response has no answer records.
Authority
hojmark.dk. 229 SOA ns.dandomain.dk. hostmaster.dandomain.dk. 2026012201 14400 3600 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0