I manage an Exchange Server 2003 SP2 (SBS 2003 R2) that will soon host multiple domains. The existing domain is locked down to receive incoming connections, by IP addresses, only from a subscribed filtering service (Postini). Ultimately, what I am aiming to achieve is to configure the server to accept all incoming connections on the newly added domains and leave the existing domain (mail) locked down to continue to receive only from Postini servers.
I have looked into adding Virtual SMTP servers for each of the new domains; adding new recipient policies for each of the new domains; configuring new SMTP connectors; and configuring routing groups. While I have found articles on each of these as individual topics, I am unsure what is the best configuration to achieve my desired results. Can anyone make a suggestion? Thanks!
Software/Hardware used: Dell PowerEdge 2900, Small Business Server 2003, Exchange Server 2003 SP2