I have an internal application which needs to send mail to external e-mail addresses. I've configured the application to use Exchange 2007 to send the mail as SMTP server. This Exchange server has HUB, Transport and CAS roles installed. However, as I have seen it is not doing so. But it is sending mail internally fine.
How can I configure Exchange 2007 so that it can send mail from the internal application and relays it externally?
Note: I am using application as a copier. And there are two copiers in the environment. Both are sending mails internally. But not route mail externally.