Can Exchange 2000 do this?

From: "Leo" <leoperis@xxxxxxxxxxxxxxx>
To: exchangelist@xxxxxxxxxxxxx
Date: Wed, 17 Apr 2002 20:15:41 -0600
Can you configure an internet connector and a routing group connector to
to route messages to the internet and to other routing groups if either of
the other links fail?

I have listed in more detail the three situations we want to cover. 

I would really appreciate any help or reference (Technet etc) to prove if
this is possible

Regards

THE PORPOSED SETUP
------------------
In a single Win2k Domain/E2k Org:

Three routing groups each with a different smtp address.

Routing Group A (name@xxxxxxxxxxx)
Routing Group B (name@xxxxxxxxxxx)
Routing Group C (name@xxxxxxxxxxx)

In each routing group there are two physical connections, 
1 to a corporate network (via a routing group connector) & 
1 to the Internet (via an Internet Mail connector):

Internet<---IMC--->Routing Group A<---RConn--->Corp Network
Internet<---IMC--->Routing Group B<---RConn--->Corp Network
Internet<---IMC--->Routing Group B<---RConn--->Corp Network

All the Internet mail connectors have the address spaces for each routing
group defined in the addresses tab.

All the routing group connectors connect to each other and all have the
same cost.

Under the two situations below would a message from a user in Routing
Group A sent to a user in Routing Group B still get there?

SITUATION 1
-----------
If the corporate network link for Routing Group A failed:

Internet<---IMC--->Routing Group A<XXXFAILEDXX>Corp Network
Internet<---IMC--->Routing Group B<---RConn--->Corp Network
Internet<---IMC--->Routing Group C<---RConn--->Corp Network

SITUATION 2
-----------
If the corporate network link for Routing Group A failed AND
if the Internet link for Routing Group B failed:

Internet<---IMC--->Routing Group A<XXXFAILEDXX>Corp Network
Internet<XXFAILEDX>Routing Group B<---RConn--->Corp Network
Internet<---IMC--->Routing Group C<---RConn--->Corp Network

I am assuming/hoping it would:
Go out from Routing Group A via it's internet link
Arrive at Routing group C via it's Internet link
Go out via the Routing Group C's corporate link &
Arrive at Routing Group B via it's corporate link

Do I have to set the IMC to specifically allow routing to domain's A, B &
C for this to happen?

Situation 3
-----------
If an email from Routing Group A was destined for a user on the Internet 
and Routing Group A's internet link was down:

Internet<--FAILED->Routing Group A<---RConn--->Corp Network
Internet<---IMC--->Routing Group B<---RConn--->Corp Network
Internet<---IMC--->Routing Group C<---RConn--->Corp Network

Would the message get to the user via another routing group?
Can Exchange 2000 do this?

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