We have our emails handled by an ISP. We installed Exchange2003 for a few users witch will use exchange features like calendar and task sharing and integrate it with MsProject. Lets say that our domain is realdomain.com and Exchange is installed under testdomain.com. Under the AD Users and Computers, on Users Properties of the Exchange domain I changed the users email address from xxxx@testdomain.com to xxxx@realdomain.com, so these users can send emails outside, because our ISP does not accept emails from unknown domains. The problem now is that when this users send emails to each other, Exchange keeps the emails itself, and I want it to forward every email to the ISP. Is this possible !?