We are running Exchange 2007 SP3 and Outlook 2007 SP2. Our users have different primary SMTP addresses and some have secondary SMTP addresses as well.
Can anyone tell me, what value does Exchange actually use to route mail between Exchange servers? Does it use any of the SMTP addresses within a user's mailbox properties, or does it use some other value altogether (legacyExchangeDN for example)?
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Internal Exchange message routing
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