Wanted to check in with the forum to validate if the following solution will work.
I have 3 Organizations that do not want to migrate/consolidate operations but need to share a single smtp name space.
Each of the Organizations hosts it's own Exchange 2003 Org and again are currently independent of one another.
I looked into address rewrite and it would require that each Org forwards their outbound mail to a single server acting as a smarthost that will perform the Address ReWrite and then send mail out to the world.
Question: If each one of the Orgs stamps their primary SMTP proxie address with the desired @domain.com, and forwards to the aforementioned smarthost so that all outbound mail exits from the same system, do we still need to perform the address reWrite?