Exchange 2003 and inter-domain email

Hello all,
   Bit of an odd situation here... I work for the US branch of a company based in the UK.  We have a domain XYZcorp.com who has a UNIX based mail server.  They wil not change to exchange.  They want to control the MX record and have all inbound mail go through the UK server.  we have an a-host entry us.xyz.com.

The exchange server in the US has its outbound recipeint policy set to:
     xyzcorp.com (primary)
     us.xyzcorp.com

Inbound mail gets fowarded from the uk mail server to user@us.xyzcorp.com

When in the office the exchange users can not send mail than to the UK mail users

Any ideas on config settings?
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shepimportAsked:
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SembeeCommented:
By having the domain listed in the recipient policy, the Exchange server will think that it is responsible for all email for that domain.

You might get away with deselecting the option that the server is responsible for all email.
Otherwise you are looking at one of the options for sharing the SMTP namespace outlined in this article.
http://support.microsoft.com/default.aspx?kbid=321721

Simon.
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