mx02.emitsolar.com has no CNAME records.
Question and response
Question
dig mx02.emitsolar.com. NS
Answer
The response has no answer records.
Authority
emitsolar.com. 578 SOA blue.foundationdns.com. postmaster.no.email.please. 2395936496 3600 600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0