mx20.aedns.ae has no CNAME records.
Question and response
Question
dig mx20.aedns.ae. NS
Answer
The response has no answer records.
Authority
aedns.ae. 3266 SOA ns1.aedns.ae. dns.aeda.ae. 2009072105 10800 900 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0