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Draconis -> RE: Mail flow in exchange 2007 (13.Sep.2008 11:53:48 AM)
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If your domains are on the same forest, this is not too much of a problem depending on what you are testing. Just create one more VM, prepare your domains with the Setup /PrepareAD and Setup /PrepareAllDomains switches and then do a typical Exchange 2007 installation on it. Internal Mailflow will be through your HUB Transport server. Of course, you will not have incoming email from the outside unless you configure one SMTP domain in your Accepted Domains list and configured the external MX records for that domain.
If you created two distinct domains in two separate forests, you will have to create an Exchange Organization (Typical Installations) in each domain and then use SMTP domains to email between the two. This will require you to configure external MX records and all that fun stuff. This will require 2 more VMs. Also, you will have to have 2 external IPs for your firewall to be able to distinguish between one domain and the other for incoming emails from the outside. If you dont have that option, you can set both MX records to point to only one external IP and forward that port to only one of your exchange servers. Then, configure that server to relay to the other so that they will be able to receive the emails from the outside.
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