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How to connect two Exchange 2003 in different domain.

I have 2 domain in different forest in each domain has 1 exchange 2003 for intranet use only.
How to setup Exchange 2003 server in each domain to enable user from domain1 can send mail to user on domain2 and vice versus.
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michaellundgren

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Thanks michaellundgren.
Can I add Exchange server in different domain to the same routing group?
If can, this solution can solve my problem or not?
No, you can't add Exchange servers from different Exchange organizations to the same routing group.
Why do you need do have the servers in the same routing group?

/Michael
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Hi michaellundgren.

I config SMTP connector follow your comment but when I send mail from domain1 to domain2 it show error "Unable to relay for user1@domain2.com".

I don't know what is problem.
Thanks

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When I try to enable "Allow messages to be relayed to these domains" I can send email with no problem but user1@domain2.com don't receive any email.
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It seem the mail that I send remain in queues.
I don't know how to fix this problem.
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ASKER

After I diable Email Auto-protect from SAV 9, the problem never happen again.