Domains - westnet.com.auagn.net.au is registered as a mail server for Westnet and it redirects through a Telstra server. It seems to be a dedicated business email server.
You can check it here
https://mxtoolbox.com/SuperTool.aspx?action=mx:gmail.com# - put agn.net.au in the search box and in the drop down menu choose "whois lookup" it will give you the details.
wn.com.au
wt.com.au
comswest.net.au
agn.net.au
midwest.com.au
denmarkwa.net.au
treko.net.au
benet.net.au
katel.net.au
hobbit.net.au
hobbit.com.au
kimberleyinternet.net.au
rainbowis.com.au
karriweb.com.au
astro.com.au
Westnet was bought by iinet around the turn of the century, which itself was recently bought by TPG
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