mx.esencia-design.com has no CNAME records.
Question and response
Question
dig mx.esencia-design.com. NS
Answer
The response has no answer records.
Authority
esencia-design.com. 2401 SOA dns.esencia-design.com. hostmaster.esencia-design.com. 1411754920 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0