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Pointing email in right direction

Posted on 2008-10-23
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Last Modified: 2010-04-07
I have placed an Edge Transport Server running Exchange 2007 in a DMZ. I currently have an Exchange 2007 running in house for email. My goal is to direct my email coming from the public through the ETS to the internal Exchange server. How do you point your email coming from outside the organization to hit the ETS 1st? What and where do you make the change? I do not understand what directs the email coming from outside to enter and pass through the ETS.
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Question by:tdbrowning
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by:Exchange_Geek
ID: 22789845
Well, that should be a simple one-liner answer. When ever an email is supposed to be sent to any user @ any domain - the domain is checked using DNS and its MX record is queried - now this is where the email needs to go. Most of the times MX record is normally your external IP address of ISA / Firewall / SMTP Gateway.

So, once the email hits any one of the above - you need to create a filter / rule for the SMTP traffic to be sent directly to your Edge server - Edge server would process the emails an forward it across to Hub server. Since, you have Edge in DMZ - you would have to open ports 25, 80, 443, 389 for traffic to be sent inside your network.
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by:tdbrowning
ID: 22790076
So basically this is a firewall change. Since my email already is directed towards my public IP and arrives just fine I only need to tell the firewall to direct any traffic coming in on the mentioned ports to change direction and hit the ETS server in the DMZ.
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Exchange_Geek earned 500 total points
ID: 22790160
Yep you got it right.

Also, you may want to read this.
http://technet.microsoft.com/en-us/library/bb232082(EXCHG.80).aspx
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