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Set second email address as default for exchange 2007 and SBS 2008

Here's my setup:
I have a external web base mail account with this domain: abc.com
I'm setting up an exchange server with domain: abc.us.  

On my exchange server(abc.us): Under the Hub transport, I created abc.com as an authoritative domain and set the email address policies to use abc.com as default send address. I setup a POP3 connector to enable me to receive emails from ep-cm.com domain.

My problem: one@abc.us masked as one@abc.com from the exchange server sends an email to the web base email two@abc.com(person which is not on the exchange server distribution list).  I get an undeliverable message. The exchange server checks the internal distribution list for matching email address.  If it cant find it the email in the distribution list, then the message is flag as undeliverable. The problem is basically the exchange server would not send the email to the abc.com domain over the internet...

Is there a way for me to set up a email policy, where I can tell the exchange server to send out the email to the internet if the recipient email address does not exist on the server???

I appreciate any help you could provide!
Khoa

Bellow is the error message I get from my exchange server: (Please keep in mind that two@abc.com is not the exchange server but he is on the Web Base email server that exist on the internet.

Diagnostic information for administrators:
Generating server: servername.abc.local
two@abc.com
#550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ##
Original message headers:
Received: from servername.abc.local ([fe80::38a6:76db:d641:491e]) by
 servername.abc.local([fe80::38a6:76db:d641:491e%10]) with mapi; Thu, 7 Jan
 2010 11:23:11 -0800
Content-Type: application/ms-tnef; name="winmail.dat"
Content-Transfer-Encoding: binary
From: one <one@abc.com>
To: "two@abc.com" <two@abc.com>
Date: Thu, 7 Jan 2010 11:23:10 -0800
Subject: Test email sent @ 11:30am
Thread-Topic: Test email sent @ 11:30am
Thread-Index: AQHKj87ZVW/xgL5foEiXVRsI/RyCIQ==
Message-ID: <CCA990B040A09F48A3935DCD6A4512E00DAC9D59@ servername.abc.local>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator: <CCA990B040A09F48A3935DCD6A4512E00DAC9D59@ servername.abc.local>
MIME-Version: 1.0
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khoango
Asked:
khoango
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3 Solutions
 
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Go to EMC and in the Email address policy select the secondary email address and hit "SetAsPrimary"
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khoangoAuthor Commented:
Thanks Rancy for the quick respond.

If i set my secondary email address to "SETASPRIMARY".  When i send out an email, then set-as-reply address would show @abc.us.  I want the reciepient show and reply to @ ep-cm.com.
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Alan HardistyCommented:
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khoangoAuthor Commented:
Alanhardisty:

You've pointed me to a great directions.  SMTP Namespace is a type of solution's that i'm looking for but my problem is that i don't have direct access to the primary server (abc.com).  The primary server is hosted by a webhosting company which in NOT usin MS EXCHNAGE.  I don't have any control over that server.

I have direct control my of the secondary abc.us domain, which is hosted by an exchange server.
Anymore  suggestions would be greatly appreciated....
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Alan HardistyCommented:
Okay - the only way that I can think to do this is to set the abc.com domain as non-authoritative on your server, thus all mail will get sent externally and you then pull down the mail from the abc.com domain using POP3 collection (something like POPCon - http://www.christensen-software.com/popcon.htm) to send the mail to the correct internal user.
Setting the domain as non-authoritative will still allow you to set your reply address as abc.com, but all mail will get sent externally to the hosted domain, which will need to have all your internal users setup on.
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khoangoAuthor Commented:
Alanarddistry: You hit the sweet spot.  I will play around with your advice... I'll keep you posted once I get it to work.  THANK YOU!!!
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Alan HardistyCommented:
No problems - fingers crossed it works.
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