mx1.systemembedded.eu has no CNAME records.
Question and response
Question
dig mx1.systemembedded.eu. NS
Answer
The response has no answer records.
Authority
systemembedded.eu. 5188 SOA ns1.netinstal.pl. root.netinstal.pl. 2023111107 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0