nsdal01.crucial.com.au has no MX records.
Question and response
Question
dig nsdal01.crucial.com.au. MX
Answer
The response has no answer records.
Authority
crucial.com.au. 900 SOA nssyd01.crucial.com.au. alerts.crucialparadigm.com. 2025120401 1000 1000 1000 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0