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Exchange 2003, hosted forwarding (aliases) email and internal relay

An outside non-Exchange email provider is the MX record for the domain like abc.org.  The provider forwards/aliases some users and has mailboxes for others.  The local on-site Exchange server POPs email from those mailboxes.  When an internal Exchange user sends email to an alias at abc.org, it fails because it cannot find the user on the local Exchange server and does not forward to the outside provider when no internal user is found.  How can I handle that situation?

Thanks!
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aspspy
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aspspy
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aspspyAuthor Commented:
I found that when I send email to a contact that has an outside email address, it tries to send that outgoing email to the old email server that was recently decommissioned and the Exchange server has not been restarted since that time.  Using nslookup on the Exchange server to check the MX record shows the correct new MX server.  I am not using smarthosts and cannot find anywhere that the old email server is configured to be used.  Would a restart of the Exchange server cause it to recognize the new MX value?
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aspspyAuthor Commented:
I worked around it by adding the old MX server name to the Exchange server hosts file and pointed it to the new MX server.
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