mail.umit.dk has no CNAME records.
Question and response
Question
dig mail.umit.dk. NS
Answer
The response has no answer records.
Authority
umit.dk. 3395 SOA mimer.deic.dk. dns.support.i2.dk. 1772111221 16384 2048 2097152 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0