mail2.domaintechnik.at has no CNAME records.
Question and response
Question
dig mail2.domaintechnik.at. NS
Answer
The response has no answer records.
Authority
domaintechnik.at. 9622 SOA ns1.domaintechnik.at. domainadmin.domaintechnik.at. 2025120200 10800 900 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0