mx4c52.megamailservers.eu has no CNAME records.
Question and response
Question
dig mx4c52.megamailservers.eu. NS
Answer
The response has no answer records.
Authority
megamailservers.eu. 450 SOA ns1.meganameservers.eu. admin.meganameservers.eu. 236 3600 300 3600000 43200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0