We have two domains now on one exchange server. abc.com and xyz.com.com. abc.com is our main domain. and xyz.com is pointing to the MX record of abc.com. My exchange server is set up to receive and send from both domains and is working fine. When I send an email from xyz.com, the recipient of that message has an option to go to the details/header of that message and see where it is coming from and it shows up as mail.abc.com. Is there a way to change this? That is, I want to set up my email in such a way that when I send from xyz.com, the details of that message should also read xyz.com. Motivation for this is that they are two seprate companies Can I do this? IF so how can I do this. To do this do I have to build another server and host xyz.com on that. Or can I do this without building another machine since I have two nics in my machine and only one is used for now Please help Thanks Sorry for the long questions. Sam