I am running a P.O.S. Exchange Server 5.5 (up for a couple of years). Some of my people have Outlook set up for both internal and external e-mail services. Recently, all of these people lost the outgoing mail capability. They could receive but not send. I was able to use the same settings on Outlook Express and had no problem on the SMTP side of things.
Here's the error that I am getting:
From: System Administrator
Sent: Wednesday, December 12, 2007 6:07 AM
Subject: Undeliverable: test
Your message did not reach some or all of the intended recipients.
Sent: 12/12/2007 5:56 AM
The following recipient(s) could not be reached:
'firstname.lastname@example.org' on 12/12/2007 6:07 AM
No transport provider was available for delivery to this recipient.
It is obvious (or is it?) that the Outlook client is trying to deliver the message through my internal mail server. I have not been able to find a configuration setting that would prevent this. By the way, I did set the Outlook client to try to deliver to an external e-mail account first.
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