Exchange 2007 error possibly related to galsync

HI,
I have been getting errors when trying to send from a user in my E2K3 <> E2K7 Exchange Org.  The problem seems to be related to sharing a namespace between the two organizations.

My setting is below.
Internet > E2K3 > SMTP Connector > E2K7.
My Exchage 2K3 is authoritative for company.com and non authoritative in E2K7.

From what I have been reading, I need to make the shared namespace non authoritatve in both Exchange organizations.  Can someone please confirm this?  One article I read shows that this can be overcome by using the SMTP Virtual server "Forward all mail with unresolved recipients to host" setting.

If it helps in answering these questions, I will be using Galsync to create contacts for users in the other forest,
When I try and send an email from old domain to a user in the new domain, I get the following error:

Below is the error I was getting.

      Barney Rubble on 11/8/2010 3:40 PM
            A configuration error in the e-mail system caused the message to bounce between two servers or to be forwarded between two recipients.  Contact your administrator.
            <abc.com #5.4.6>


dross333Asked:
Who is Participating?
 
BusbarConnect With a Mentor Solutions ArchitectCommented:
yes you need to configure shared SMTP name space
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dross333Author Commented:
Thanks.  butm, Could I just use this instead?

Using the SMTP Virtual server "Forward all mail with unresolved recipients to host" setting.
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dross333Author Commented:
I am trying to figure out what is the benefit/disadvantage of using one method over the other.

Method 1. Make shared namespace non authorittive
method 2:  Using the SMTP Virtual server "Forward all mail with unresolved recipients to host" setting.

Please provide any input based on previous experience.

Thanks
David
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