mx3.itandtel.at has no CNAME records.
Question and response
Question
dig mx3.itandtel.at. NS
Answer
The response has no answer records.
Authority
itandtel.at. 3451 SOA dns3.itandtel.at. support.itandtel.at. 2026021901 43200 7200 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0