mx.audisiostufe.com has no CNAME records.
Question and response
Question
dig mx.audisiostufe.com. NS
Answer
The response has no answer records.
Authority
audisiostufe.com. 600 SOA ns39.domaincontrol.com. dns.jomax.net. 2026021346 28800 7200 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0