mx.emsincorperated.com has no CNAME records.
Question and response
Question
dig mx.emsincorperated.com. NS
Answer
The response has no answer records.
Authority
emsincorperated.com. 3583 SOA dns.emsincorperated.com. hostmaster.emsincorperated.com. 1639151349 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0