I'm supporting a company that was formerly part of a larger company that split into two separate companies. They both have new domain names, but email to the original domain name still exists and is handled by our new Exchange 2007/SBS 2008 server. So, we're hosting both the original company domain name and also our new company domain name on our Exchange server.
We've agreed to forward mail to the other half of the original company... that formed their own separate company with their own domain name.
We'd like to setup forwardings on our Exchange server to forward mail to users at the other company, but don't necessarily want to have to setup AD accounts for these users since they're not part of our company any longer.
What's the best way to do this?