mail.edis.at has no CNAME records.
Question and response
Question
dig mail.edis.at. NS
Answer
The response has no answer records.
Authority
edis.at. 10800 SOA ns1.edis.global. root.edis.at. 2026030401 10100 1810 605800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0