Move exchange server 2003 from one server to another

We have a server acting as our DC and Exchange server. I would like to migrate Exchange to a new server. Thsi is exchange server 2003. How can I do this as efficient as possible?
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In two words - you have to install a second server, migrate all mailboxes and other things to it and finally uninstall the first server.
It's really not a complex task:

Those are what I followed a while back for a client migration of Exchange 2003.

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Mestha wrote an excellent guide, step by step, about migrating Exchange 2003
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make sure to make the new one as Master.
Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
Do a swing migration.

Full info here
dolphan757Author Commented:
I have setup a second exchange server (2003). Both servers' settings are identical. I have migrated only my mailbox. I can send to anyone within our organization with no problem. If I send to someone else in another domain I get the following Undeliverable email: on 6/1/2009 2:22pm
There was a SMTP communication problem with the recipients email server. Please contact your system adminstartor.
< #5.5.0 smtp,553 sorry, tat domian isnt in my list of allowed rcphosts (#5.7.1)>

Oddly enough the receipient gets the email message. Sometimes they get it and soemtimes they dont. but I get the undeliverable message evrytime. Any suggestions?

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