mx01.everscale-mail.com has no CNAME records.
Question and response
Question
dig mx01.everscale-mail.com. NS
Answer
The response has no answer records.
Authority
everscale-mail.com. 3093 SOA ns01.everscale-dns.com. postmaster.everscale-mail.com. 2022040004 14400 604800 3600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0