mx1.dclgroup.eu has no CNAME records.
Question and response
Question
dig mx1.dclgroup.eu. NS
Answer
The response has no answer records.
Authority
dclgroup.eu. 3477 SOA ns1.eurodns.com. hostmaster.eurodns.com. 2025031700 86400 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0