mail.webstarthost.net.au has no MX records.
Question and response
Question
dig mail.webstarthost.net.au. MX
Answer
The response has no answer records.
Authority
webstarthost.net.au. 3600 SOA dns1.webstarthost.net.au. admin.webstarthost.com.au. 1768204632 3600 1800 259200 3600
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0