relay.localdc.net.au has no MX records.
Question and response
Question
dig relay.localdc.net.au. MX
Answer
The response has no answer records.
Authority
localdc.net.au. 300 SOA ns1.localdc.net.au. cdcalerts.localdc.net.au. 2025021203 7200 3600 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0