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Originally Posted by AnonymousCoward
What protocols are you guys using to send email using Outlook?
If connecting back to an Exchange 2003/2007 server, then RPC over HTTPS (now called "Outlook Anywhere") works just fine. That tunnels everything over HTTPS. As mentioned earlier in the thread, ensure that you have "logged" in to the Telstra network first.
If you are using SMTP or IMAP, then perhaps the ports are being blocked? You may need to route the mail through a Telstra SMTP server
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That's what I was about to suggest for wallacej, the other alternative is to use an authenticated SMTP address (YMMV as to whether your mail host supports this from hosts other than their own, FWIW iiNet seems to work a treat).