mail.gidutex.de has no CNAME records.
Question and response
Question
dig mail.gidutex.de. NS
Answer
The response has no answer records.
Authority
gidutex.de. 10800 SOA ns1.domain24.de. hostmaster.domainbestellsystem.com. 2025121201 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0