mx1.psa.at has no CNAME records.
Question and response
Question
dig mx1.psa.at. NS
Answer
The response has no answer records.
Authority
psa.at. 493 SOA ns1.psa-services.net. hostmaster.psa-services.net. 2024061001 7200 900 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0