I have a situation where I need to configure the SMTP protocol on our webserver (server 2003) to send out mail from another internal server that runs an application requiring outgoing SMTP via a smarthost (dyndns).
I have the dyndns account, and have used it successfully in many instances of exchange to forward out mail. I know it works, and I know what its capable of.
However, I am a bit lost on the SMTP side of the server 2003. I have installed the protocol, but I am a bit unclear how I should set up the local and remote domains. The actual email domain resides on a mailserver outside of the organization. Lets call its xyz.com. Users from the organization use pop3 to get xyz.com mailboxes from this mailserver which is on the ISP. (I know its a tradgedy to operate this way, but it will hopeully change soon).
Anyways, the software on the internal network authenticates with the webserver (using SMTP) to send notification messages out to clients on their email domains, and then a notification that a order was placed to email@example.com. I cant quite figure out why its not working, but I have a sneaky suspicion that its got some kind of relay problem. Can anyone tell me exactly what to set up for the local and remote side to enable the SMTP to communicate and send messages from it internally (firstname.lastname@example.org or whatever email address neccessary) to the actual email@example.com on the ISP mailserver?? Hope this makes sense. Thanks.