Outlook cleint error "#5.7.1 smtp;550 5.7.1 Unable to relay for...

G

Guest

Hello,

We have been on Exchange 2003 SBS for five months.
We have been able to repsond to all addresses until recently when we had to
re-ip the Netscreen firewall because TIme Warner needed all business
customers to re-ip the network.

This error #5.7.1 smtp;550 5.7.1 Unable to relay for
happens when trying to respond to a few addresses that they have always been
able to respond until recently.


Any ideas would help
 
J

Jeff Stephenson [MSFT]

You need to make sure that you're authenticating to your outgoing server.
 

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