You need to ensure that all email messages sent to the Internet from the Exchange Server 2003 organization are relayed through the Edge Transport server.

Your company has one office in New York. The office is configured as an Active Directory site.

All domain controllers in the forest run Windows server 2003 SP2. All client computers run Windows XP SP2.

You have an Exchange Server 2003 organization. All servers in the organization run Exchange Server 2003 SP1.

Corporate security policy states that the Exchange servers cannot be managed by using Remote Desktop sessions.

You plan to deploy Exchange Server 2010 SP1 server to the network.

You have a server that runs Windows Server 2008 SP2.

You install the Edge Transport server role on the server.

You need to ensure that all email messages sent to the Internet from the Exchange Server 2003 organization are relayed through the Edge Transport server.

What should you do?

A.
Suppress link state updates.

B.
Install Exchange Server 2003 SP2.

C.
Add a mail exchange (MX) record to the internal DNS zone.

D.
Modify the smart host settings.

E.
Install Windows Server 2008 R2.

F.
Add a mail exchanger (MX) record to the public DNS zone.

G.
Run setup /r:mt.

H.
Run setup /rps:server5.

I.
Modify the Internet Information (IIS) authentication settings.

J.
Install Windows 7.
K.
Run setup /nprs:server5.
L.
Run setup /mode:upgrade.

Explanation:
Modify the smarthost settings of the Exchange 2003 organization to ensure mail goes via the Edge server. You would need to first make sure the Edge transport server can send to the Internet but that is not an option.

Reference:

http://technet.microsoft.com/en-us/library/bb124011.aspx