Posted on 2007-11-14
SCENARIO: We have an exchange server (2007) in place and working properly. Inbound e-mail, destined to us, is first sent to our ISP's MTA, which we then forward (after they spam check via Postini) to the aforementioned (internal) Exchange server. To send out, our internal Exchange server uses our ISP's MTA as a smarthost.
Our ISP will not assign us an alternate IP address in an alternate block.
REQUIREMENT: Properly working Exchange server and reliable inbound / outbound e-mail.