mx20.aeda.net.ae has no CNAME records.
Question and response
Question
dig mx20.aeda.net.ae. NS
Answer
The response has no answer records.
Authority
aeda.net.ae. 2044 SOA ns1.aeda.net.ae. root.aeda.net.ae. 417 3600 900 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0