mxsharedvm1.mdocs.de has no CNAME records.
Question and response
Question
dig mxsharedvm1.mdocs.de. NS
Answer
The response has no answer records.
Authority
mdocs.de. 3143 SOA ns014.paragon-cc.de. ddi-pl.atos.net. 2024010970 12000 2400 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0