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Two E-Mail domains on one Exchange Server??

Does somebody know, how I can setup two E-Mail domains on one Exchange 5.5 Server???
I've looked in several Documentations and on the microsoft page and cannot find any hind how I can do this.

The domains are routet by a Cisco 800 Router to a Firewall. On this firewall ist postfix running, which routes the E-mails to the Exchange server.
I Know how i can divide the two domains with postfix, but how can I install the second E-Mail domain on the exchange server????
1 Solution
Under the IMC routing tab add the new donain as inbound. Also assuming some of your users are user@domain1.com and others are user@domain2.com you will have to manually edit their SMTP addresses to reflect this. You can add the extra address for each user and then set the default you want the user to send as.
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