Forwarding email from Groupwise 6.X to Exchange 2003 at the SMTP level

OK. I'm a Windows Exchange administrator and have little experience in Novell, but the company who acquired us runs Groupwise. Here is the scenario.

We run Windows 2003 SP1 with Exchange 2003 oSP2 over it.

They want us to send and receive email from their domain name, user@theircomapny.com. My idea was to use their servers as front-end to ours, meaning any mail going to user@theircomapny.com forwards to user@ourcompany.com.

I set up an SMTP alias on our Exchange server for user@theircompany.com and set it as primary for our email accounts so that anything we send will look like it is coming from their email domain name. That isn't a problem because Exchange is pretty resilient that way.

From the Groupwise side, the only thing I have seen is to set up a forward rule in the actual Groupwise account. This isn't optimal because everything we receive is an attachment.

This is the question: They are running Groupwise 6.X. Is there any way to forward at the SMTP level on the Groupwise server so that it never touches the real mail account and we don't have to set up rules to accomplish this task? In other words, we want email to hit their mail server and forward to ours automatically. Is that possible?

I have always worked in Windows. I don't have anything against Groupwise or Novell, and would welcome learning a new mail platform. I hear there are really excellent features in GW as far as calendaring functions and such. However, I also don't like making complicated changes that require integrating the two mail platforms unless there is an easy way to do it.

Any suggestions or help are appreciated.

JB