mail2.webmad.de has no CNAME records.
Question and response
Question
dig mail2.webmad.de. NS
Answer
The response has no answer records.
Authority
webmad.de. 10490 SOA ns-a2.webmad.de. s\.roefky.webmad.de. 2026020101 10800 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0