We are experiencing a "no transport" error when users try to send mail to
accounts on the internet. All clients are Outlook 2000. The error occurs
regardless of whether the user enters the email address from the contacts
presses the send button they receive a message from System Administrator
title "Undeliverable:... message title...". The contents of the message
Your message did not reach some or all of the intended recipience
Send: 1/1/2002 10:00AM
The following recepients could not be reached:
No transport provider was available for delivery to this recipient.
This error started occur over a weekend. Last week these users had no
problems sending email.
After playing around a bit we discovered that the only users that have the
problem where the ones who did NOT have their mail stored locally in a .PST
file. In fact, when we created personal folders for these users they could
send mail without a problem.
Does anyone have any idea why this is happening?
We have an Exchange 5.5 server running on Windows NT 4.0 SP5. The outlook
clients are set up as Corporate or Workgroup and have their own Internet
Mail services configured. As far as I can tell the Outlook client
configurations are correct. They point to the ISP's mail server.
It almost seems as if the people that were storing their mail on the
Exchange server were using something on Exchange to address and send their
mail. While those that had a PST were not.
Any help in understanding this strangeness would be greatly appreciated.