ns01.everscale-dns.com has no MX records.
Question and response
Question
dig ns01.everscale-dns.com. MX
Answer
The response has no answer records.
Authority
everscale-dns.com. 3600 SOA ns01.everscale-dns.com. postmaster.everscale-dns.com. 2019040103 14400 604800 3600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0