Re-submitting this in a different zone...
I've inherited a problem where we have 2 sites... one site with exchange 2003, and another site with an SBS 2003 server. The SBS 2003 has been using the pop3 connector to download messages from the exchange server site... and using the small business smart connector to forward their mail thru the exchange server.
After reading up, I wanted to use SMTP connectors, share the namespace (as in Microsoft KB321721) and have the mail use the exchange server as the primary server, and anything that doesn't resolve, go thru the connector to the SBS 2003 server. (which I haven't had to really modify)
I followed the KB, got everything to work with delivery (internal and external), but somehow I've either created a loop, or missed something, as I no longer get and NDR's when I send to a non existant e-mail address.... it just stays with in the 'messages pending for deferred delivery'
The KB says 'If exchange doesn't find any match, a non-delivery report (NDR) is generated with error code 5.4.0' but I that doesnt seem to happen (unless its a very delayed reponse).
How do I get NDR's to be generated?
I'm a novice with exchange... so let me finish with, if there is a better way to do this with the two sites (short of connecting them and putting them in the same domain, as we can't do that now) I'm open to it.