bounce-mx.eversrv.com has no CNAME records.
Question and response
Question
dig bounce-mx.eversrv.com. NS
Answer
The response has no answer records.
Authority
eversrv.com. 1800 SOA leonard.ns.cloudflare.com. dns.cloudflare.com. 2397811322 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0