mx.hostedemail.com has no CNAME records.
Question and response
Question
dig mx.hostedemail.com. NS
Answer
The response has no answer records.
Authority
hostedemail.com. 68 SOA ns1.mdnsservice.com. hostmaster.mdnsservice.com. 2800684411 10001 7200 2419200 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0