mx1.ebit.at has no CNAME records.
Question and response
Question
dig mx1.ebit.at. NS
Answer
The response has no answer records.
Authority
ebit.at. 2772 SOA ns1.ebit.at. domains.ebit.at. 2026012914 1200 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0