m2.emailowl.com has no CNAME records.
Question and response
Question
dig m2.emailowl.com. NS
Answer
The response has no answer records.
Authority
emailowl.com. 1102 SOA lily.ns.cloudflare.com. dns.cloudflare.com. 2398047966 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0