Scenario:
Migrating from Exchange 2003 to Exchange 2007 and we have external POP3S clients.
All Exchange 2007 Roles are running on the single new Exchange 2007 server.
Problem:
Exchange 2007 Default: Relaying for external authenticated users/computers is not permitted. (by using the pop3s basic authentication for SMTP)
They get the SMTP error "Server Response: '550 5.7.1 Unable to relay', Port: 25"
I cannot figure out figure out how to permit relay for authenticated computer/user.
(I am surprised at how diffiicult they have made Exchange 2007 to configure > mostly command line - - does anyone know why most of the configuration is no longer graphical ?)
Thanks
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