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How does exchange know where to route mails in where there are multiple servers

I need some rudimentary Exchange advice:-

Supposing I had one MX record which accepted all emails for the organization.  and I had an exchange server in New York, DC and Miami.  All mail is accepted and processed by the New York server.  How does exchange process an email that is bound for the DC or Miami office?  a) how does it know that a users mailbox is located on say the DC server, and b) what is the mechanism for routing that message from the incoming NY server and then passing it on to either the DC or Miami server?

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zejoka
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zejoka
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gupnitCommented:
Hi,
Based upon the Lookup that is done for the user, the categorizer verifies whether it will be a local devliery (NY server) or any of the remote server where the Users Mailbox is located.
Now from NY to other Server, if they are in same Routing Group, then it is routed automatically. But across WAN Links we prefer different Routing Groups to define what/when messages flow via Ruoting Group COnnectors.
Here is a link to guide you...http://technet.microsoft.com/en-us/library/bb123864(EXCHG.65).aspx
Hope this helps, let me know
Cheers
Nitin
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gupnitCommented:
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zejokaAuthor Commented:
We are on an MPLS network, so I'm thinking routing group connectors are pointless (given that there is only 1 server on each site so there would only ever be one replication process anyway, ergo moot)

When you say "lookup", is this an AD lookup?
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gupnitCommented:
Hi,
Yes if server it will be one replication only, but what happens when you want to make sure that Network is not clogged and want to schdule that all large messages beyond lets say 20MB should be replicated in the night etc etc, it is there that RG Connectors come into picture. As such since you are no facing issues cool let it is single RG
AD Lookup, yes Exchange uses closest Global Catalog for information - effectively AD lookup. See all info is storred in the AD, hence cannot do without lookups
Cheers
Nitin
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zejokaAuthor Commented:
OK, thanks, I'm gong to issue a new question expanding above the scope of this one.
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gupnitCommented:
Sure thing....Well I would have answered here also, if it was not too much ;-)
Cheers
Nitin
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