mail02.samhammer.de has no CNAME records.
Question and response
Question
dig mail02.samhammer.de. NS
Answer
The response has no answer records.
Authority
samhammer.de. 3397 SOA anycast1.irondns.net. hostmaster.globvill.de. 2025122901 28800 3600 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0