Our company was setup with two email domains on our exchange server. Recently one of the companies was spun off and now hosts their email with a hosting company. They receive all of their mail just fine unless it was sent from within our network. It seems that our network still thinks the domain is here but it is not. I found another postini about a similar issue but I tried what was suggested but nothing happened. I need to get this fixed but have not been able to do so on my own.