mailserver.cre8ives.de has no CNAME records.
Question and response
Question
dig mailserver.cre8ives.de. NS
Answer
The response has no answer records.
Authority
cre8ives.de. 3339 SOA ns1.cre8ives.eu. hostmaster.cre8ives.de. 2026020005 3600 900 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0