mail.trafiktestet.se has no CNAME records.
Question and response
Question
dig mail.trafiktestet.se. NS
Answer
The response has no answer records.
Authority
trafiktestet.se. 69 SOA ns1.curanet.dk. hostmaster.curanet.dk. 2025051801 14400 3600 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0