mailout.intergenia.de has no CNAME records.
Question and response
Question
dig mailout.intergenia.de. NS
Answer
The response has no answer records.
Authority
intergenia.de. 2560 SOA ns1.nameserverservice.de. hostmaster.ns1.nameserverservice.de. 2025120214 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0