ip4.superloop.au has no MX records.
Question and response
Question
dig ip4.superloop.au. MX
Answer
The response has no answer records.
Authority
ip4.superloop.au. 3600 SOA ns1.superloop.com. hostmaster.superloop.com. 2026021901 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0