I have pointed the MX records through the hosting companies DNS servers for one of our domain names (example: test.com) to an Exchange server that I set up - created a domain called test.com. Named the computer exchange (exchange.test.com) - all mail is being sent and delivered fine - NOW, if I point one of our other MX records for another domain (example: hello.com) to the same server (exchange.test.com), where I have the same users for both domain names, could a user on the server now recieve mail from both domain names? And if so, when replying, what email address would it be coming from - if this is possible, do I have to set up another virtual SMTP server?