relay.data-cross.de has no CNAME records.
Question and response
Question
dig relay.data-cross.de. NS
Answer
The response has no answer records.
Authority
data-cross.de. 149 SOA ns01.kraemer-it.cloud. contact.tec4u-solutions.com. 2025101505 10800 3600 604800 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0