mxin1.austriacloud.at has no CNAME records.
Question and response
Question
dig mxin1.austriacloud.at. NS
Answer
The response has no answer records.
Authority
austriacloud.at. 3217 SOA dns5.a1.net. domainadmin.a1.net. 2017110800 86400 7200 3600000 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0