mail.waveride.at has no CNAME records.
Question and response
Question
dig mail.waveride.at. NS
Answer
The response has no answer records.
Authority
waveride.at. 785 SOA ns1.edis.global. root.edis.at. 2022010170 10000 900 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0