Error message: Server error 550:0x800CCC79 Relay denied...

I am sending an e-mail thru Outlook Express connected to our mail server in a LAN. The mail server is sitting behind a firewall. I am getting the error message:
Server error 550:0x800CCC79 Relay denied from to
Please see some of my earlier questions on relaying. There are a lot of variables that must be set.
This was first published in April 2002

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