Apex domains cannot have CNAME records.
Question and response
Question
dig eu.messagegears.net. NS
Answer
eu.messagegears.net. 4 NS ns-600.awsdns-11.net.
eu.messagegears.net. 4 NS ns-1507.awsdns-60.org.
eu.messagegears.net. 4 NS ns-1883.awsdns-43.co.uk.
eu.messagegears.net. 4 NS ns-329.awsdns-41.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0