mx0101.titan.email has no CNAME records.
Question and response
Question
dig mx0101.titan.email. NS
Answer
The response has no answer records.
Authority
titan.email. 50 SOA ns-451.awsdns-56.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0