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550.5.1.1 User Unknown Exchange 2003 [message #1672] Mon, 16 April 2007 21:01 Go to previous message
John Neptune
Messages: 1
Registered: April 2007
Junior Member
I am attempting to install NST on Exchange 2003 with single IP address. During the setup and configuring of the SMTP port information, when I click on the Test button, I get the message 550.5.1.1 User Unknown. I have the Incoming port as 26 and the outgoing port as 25. I know that 25 is correct as I can telnet to that IP address and port and get a response from the mail server.

Any ideas?
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