EX2003 how does a backend mailbox server route it's mail to the SMTP bridge head?

how does a backend "mailbox server only" in exchange 2003 send mail to the SMTP "Bridgehead", and how about the other mailbox servers in the farm?
Routing connectors?
my previous implementations with multiple server were distributed, and each used the SMTP service to send all their own mail (each location).
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cvvoodAsked:
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SembeeConnect With a Mentor Commented:
All inter-server traffic goes by SMTP. Whether it is internal email or external email being moved to the bridgehead for delivery.

Simon.
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cvvoodAuthor Commented:
TY simon, That is what I thought.  Routing groups are for between low bandwidth connections...correct?

you've been a real help over the past few years....

chris
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SembeeCommented:
Routing Groups allow you to control who the email messages flow, not always for low bandwidth sites - although they can help.
I usually use routing groups to force external outbound email to leave the org by the shortest route, but they can also be used to move email between servers by different paths - it all depends on how complex your environment is.

Simon.
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