mxb.sw.oz.au has no MX records.
Question and response
Question
dig mxb.sw.oz.au. MX
Answer
The response has no answer records.
Authority
sw.oz.au. 3600 SOA ns.sw.oz.au. chris.sw.oz.au. 2026011300 172800 7200 3628800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0