mx0.hosteurope.de has no CNAME records.
Question and response
Question
dig mx0.hosteurope.de. NS
Answer
The response has no answer records.
Authority
hosteurope.de. 300 SOA dns.hosteurope.de. hostmaster.hosteurope.de. 2026012002 3600 900 3600000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0