mail.teknikbyran.com has no CNAME records.
Question and response
Question
dig mail.teknikbyran.com. NS
Answer
The response has no answer records.
Authority
teknikbyran.com. 10800 SOA ns1.teknikbyran.com. registry.teknikbyran.com. 2024072400 28800 3600 3600000 43200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0