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The only Exchange facility for doing something like this would be to use
a Forwarding Address where you can send all messages to an address on a
different domain simulating your environment. There is an option on
Forwarding where you can deliver messages to both forwarding address and
mailbox, thereby keeping the primary system working as you want.
Often it is enough to set up your lab to be similar, though not actually
duplicate the actual messages from the live messaging network. If what
you are after is estimating whether your new system can handle the load,
there are tools to let you simulate traffic. In addition to messages
received, such tools can simulate a level of responses to many mailboxes
that you would not be able to fully mimic in a manual test environment.
I should also point out that there are more sophisticated solutions for
data replication and disaster recovery scenarios, but they are complex
and costly.
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