I found the same thing on the 19th May and reported the problem including the ping test and a tracert results:
Pinging users.tpg.com.au [203.26.24.80] with 32 bytes of data:
Request timed out.
Tracing route to users.tpg.com.au [203.26.24.80]
over a maximum of 30 hops:
1 1 ms 12 ms 14 ms 192-168-1-1.tpgi.com.au [192.168.1.1]
2 14 ms 13 ms 13 ms 10.20.22-139.tpgi.com.au [10.20.22.139]
3 29 ms 29 ms 28 ms 203-219-155-130.tpgi.com.au [203.219.155.130]
4 26 ms 29 ms 30 ms syd-gls-har-crt2-be-10.tpgi.com.au [202.7.173.17]
5 35 ms 23 ms 28 ms syd-sot-ken-crt2-he-0-3-0-0.tpgi.com.au [202.7.162.78]
6 23 ms 24 ms 21 ms syd-sot-ken2-bras22-Te-0-1-0.tpgi.com.au [202.7.214.254]
7 * * * Request timed out.
8 * * * Request timed out.
To me it is a failure to connect to the next link after 202.7.214.254. (Simple?)
On Sunday and Monday I repeated the same information and even provided the above output.
Monday evening I received the following
Thank you for your email.
We understand that you're having an issue with your web mail. We will assist you accordingly regarding this issue.
Please be inform that there is an ongoing maintenance for our web servers.
Our Webmaster are already doing the repair. We will keep you posted once we have an update.
This, to me has NOTHING to do with the MAIL Server, its the system used for the users.tpg.com.au,
which happens to be [203.26.24.80]
Oh please get some engineers who listen to the complaint!
