mx1.sarkor.com has no CNAME records.
Question and response
Question
dig mx1.sarkor.com. NS
Answer
The response has no answer records.
Authority
sarkor.com. 5082 SOA ns1.sarkor.com. support.sarkor.com. 2023021301 86400 7200 3600000 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0