Mail routing to wrong Exchange server

I am about to move one of my newly acquired sites into our Exchange organization. The Exchange 2003 server is in place and the accounts have been created. Currently DNS still points to their old Exchange 5.5 server and this is the server the users are logging into.

Since it is a small office that is using Outlook to connect via POP, we are going to migrate the PST files within Outlook to their new mail profile therefore populating the new mailboxes.

Problem is, when internal people try to send mail using their internet address, the mail attempts to send to the new Exchange server, even though SMTP is turned off and there is no Recipient Policy for the domain name. The new Exchange server is actually turned off but it still queues to the new server.

How do I disable this until I am ready to migrate? I need people sending mail to user@newdomain.com to be able to send to the old server until they are moved over.
wooliebAsked:
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patelbg2001Commented:
from a workstation / server telnet to your Exchange 5.5 server on port 25... use command line to send an email to your yahoo/hotmail/gmail account see if this gets through.  I cannot see how mail is being relayed to your organisations Exchange server.  Is SMTP using smart host (IP Addresses) or DNS??

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patelbg2001Commented:
Presuming that they are using SMTP to send their emails, has their been ammendments to SMTP connector on the Exchange 5.5 server???
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wooliebAuthor Commented:
They are using SMTP. There has been absolutely no change on their mail server.

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patelbg2001Commented:
And the Exchange 5.5 server is totally independant from the Exchange 2003 server?
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patelbg2001Commented:
whats the SMTP connector on the Exchange 5.5 server pointing to??? DMZ front end, ISP??
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wooliebAuthor Commented:
The Exchange 5.5 server is completely separate. The sites are connected via MPLS but the domain that all of our other Exchange servers are in does not know that their NT4 domain exists.

The Exchange 2003 Server is in our domain but is not powered on.

The 5.5 server is pointing to a third party service they use to manage spam, like a Postini.
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wooliebAuthor Commented:
DNS.

Question, can I put some form of forwarder in the Exchange 2003 server that will send all mail for @domain.com to that specific server?
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patelbg2001Commented:
it is possible... go through your mx records
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wooliebAuthor Commented:
Actually, I resolved the problem by creating a new SMTP Connector and had all e-mail from @domainname.com forward via IP address to the old server. Thanks for your help.
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