mx1.remote.management has no CNAME records.
Question and response
Question
dig mx1.remote.management. NS
Answer
The response has no answer records.
Authority
remote.management. 632 SOA ns-246.awsdns-30.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0