mail3.inetadmin.eu has no CNAME records.
Question and response
Question
dig mail3.inetadmin.eu. NS
Answer
The response has no answer records.
Authority
inetadmin.eu. 865 SOA ns.inetadmin.eu. root.inetadmin.eu. 1771542067 86400 900 1209600 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0