collect pop3 mail for Exchange 2003 server

Hi I need to collect pop3 email for a SBS 2003 server for a domain that isn't local.

The problem I have is that the exchange server is setup with domainA.com and the pop3 collector is set domainB.com  I can't add domainb.com to the Exchange default policy (Email address) as it stops internal users sending emails outside of the server to domainb.com.  If i add the domainB to the exchnage default policy pop3 works fine for users with addresses setup on the server for domainB, but if they try to send an email outbound to someone@domainb.com exchange reports no such user?  

I have got over this in the past with other clients, but I can't remember how.  i have tried products like Exchangepop3collector and the collector that comes with SBS but if the domainB.com doesn't exist in Exchnage default policy the email is returned.

Does this make sense, and can anyone help?

Thanks
dcleaverAsked:
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dcleaverConnect With a Mentor Author Commented:
I think I have found the problem.  When adding a default recipient policy in Exchnage I need to take the tick out of "This Exchnage Policy is responsible for all emails sent to this domain.

Now I have added back domainB and taken removed the tick, it now seems happy to look for recipients for domainB outside of it's own exchange server.

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kcoectCommented:
With Exchange you should be able to add additional e-mail addresses to the default recipient policy and specify which one you want exchange to set on each user by default and in addition to that, you can set in the properties of a users account the default address you want to use for sending mail and you can also clear the check box that allows exchange to update the recipient address of that specific account.
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dcleaverAuthor Commented:
Thanks Kcoect

If I add DomainB.com to the default recipient policy, it will stop users on domaina.A  sending to external users on domainB.com.  DomainB.com is a large company who have their own email server looking after domainB.com so Exchange looking after domainA also thinks all recipients for domainB are local which they are not.

Thanks
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Alan HardistyCo-OwnerCommented:
You need to setup SMTP Namespace Sharing.  Please have a read of the following article for details of what to do:

http://www.msexchange.org/tutorials/Exchange-2003-SMTP-Namespace-Sharing.html
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Alan HardistyCo-OwnerCommented:
You mean "This Exchange Server is responsible".

That should help.
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dcleaverAuthor Commented:
yep that the one!
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Alan HardistyCo-OwnerCommented:
This question has been classified as abandoned and is being closed as part of the Cleanup Program.  See my comment at the end of the question for more details.
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