postfix.mcxplatform.de has no CNAME records.
Question and response
Question
dig postfix.mcxplatform.de. NS
Answer
The response has no answer records.
Authority
mcxplatform.de. 600 SOA pdns05.domaincontrol.com. dns.jomax.net. 2025102701 28800 7200 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0