mx.dataix.eu has no CNAME records.
Question and response
Question
dig mx.dataix.eu. NS
Answer
The response has no answer records.
Authority
dataix.eu. 6223 SOA ns.gblnet.ru. noc.dataix.ru. 2026022601 21600 1800 1234000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0