Hello. I have a server running Server 2003. It is on the domain but is not the exchange server. It has a small program that is supposed to use email (via Exchange account) to mail out an auto-generated report to internal and external email addresses. The internal email goes out fine but the external get the following error:

Sorry, your message to [email protected] could not be delivered.

The specific error is:
The following recipients are unknown: [email protected]
(made-up email of course!)

I can use this account to email out just fine if I use Outlook, but it will not send out external email otherwise, so it should not be an issue with the Exchange account or rights. Any help fixing this would be very much appreciated!

Thanks!