mail.icip.de has no CNAME records.
Question and response
Question
dig mail.icip.de. NS
Answer
The response has no answer records.
Authority
icip.de. 60 SOA ns10.icip.de. hostmaster.icip.de. 2026022201 3600 300 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0