I am in the process of replacing our Exchange 5.5 servers with Exchange 2003. I have two servers left and one is acting as a Gateway server. It sits after our AV scanner and before our Exchange 2003 servers. It is in the same domain as our Exchange servers. It then sends mail to other mail servers in the using relays. We have five different servers we relay mail to. Two of which are using Sendmail the others are using Exchange. I need to replace it with a 2003 server. The Exchange 5.5 Gateway server is in its own site and generates its own email address. It has an Internet Mail Connector. We then have recipients which forward mail to the Exchange 2003 and Sendmail servers. So really the Exchange 5.5 Gateway just passes through the messages based on the recipients forwarding email address. I am looking for advice on how to put in an Exchange 2003 server to replace it. I know I can use an SMTP connector. But I am not sure how to configure it or if I need to create a seperate domain to generate the same email address.