com13.servicemail24.de has no CNAME records.
Question and response
Question
dig com13.servicemail24.de. NS
Answer
The response has no answer records.
Authority
servicemail24.de. 2883 SOA dns009.arvato-systems.de. hostmaster.bnic.bertelsmann.de. 2026022700 3600 1800 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0