mx.mel.iprimus.com.au has no MX records.
Question and response
Question
dig mx.mel.iprimus.com.au. MX
Answer
The response has no answer records.
Authority
iprimus.com.au. 300 SOA ns1.iprimus.com.au. hostmaster.iprimus.com.au. 2026021305 10800 3600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0