mailbackup.edis.at has no MX records.
Question and response
Question
dig mailbackup.edis.at. MX
Answer
The response has no answer records.
Authority
edis.at. 14400 SOA ns1.edis.global. root.edis.at. 2026021302 10100 1810 605800 86400
Additional
. 0 OPT ; payload 1400, xrcode 0, version 0, flags 0