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Port 25 blocked in the Koru Lounge wireless internet - why?

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The Koru lounges offer free wireless internet for its users. I normally use Outlook HTTP to access mail and that works fine. But lately I have been wanting to access my personal mail and use Outlook, not a web service. I could never get sending mail to work - always some authentication error or some other wierd error. And to make it more confusing, if using Outlook on the same machine I connected to the Internet using my cellphone (over the VF network via Bluetooh) or for that matter, Wellington Airport's free wifi service mail would go out fine.

I am not using an ISP SMTP server but my own domain's server with authentication.

Then I had an inspiration - perhaps Koru is blocking port 25. Sure enough when I switched to the alternate port offered by my mail hosting provider, mail went out fine.

So that raises the question - what security issues could there for AirNZ to block port 25 on their free wifi service and of course not tell anybody about it?

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