mail.root24.de has no CNAME records.
Question and response
Question
dig mail.root24.de. NS
Answer
The response has no answer records.
Authority
root24.de. 1067 SOA ns1.root24.de. jh2000.root24.eu. 2025122900 3600 1800 1500000 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0