mx.mikrotec.com has no CNAME records.
Question and response
Question
dig mx.mikrotec.com. NS
Answer
The response has no answer records.
Authority
mikrotec.com. 36 SOA ns1.mis.net. noc.mis.net. 2025041801 10800 3600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0