You are a messaging professional. Your company, A. Datum Corporation, uses a Microsoft Exchange Server 2007 messaging system. A. Datum deploys an Edge Transport server and enables edge synchronization.

A. Datum acquires a new company named Contoso, Ltd. Contoso uses a Microsoft Exchange Server 5.5 messaging system. The external SMTP domain names for the two companies are adatum.com and contoso.com respectively.

A WAN connection is installed between A. Datum and Contoso. This WAN connection is used to send and receive e-mail messages. The e-mail messages sent to each company on the Internet are delivered directly to the SMTP server of the respective company.

Your company decommissions the SMTP server that receives e-mail messages on the Internet at Contoso.

Your company plans to route e-mail messages for users at Contoso through the Internet connection at A.

Datum. You modify the MX record for contoso.com to refer to the host record of the Edge Transport server that is used by A. Datum.

You need to ensure that each company continues to receive e-mail messages on the Internet.

What should you do to ensure that each company continues to receive e-mail messages on the Internet?

A.
On the Exchange Server 2007 Edge Transport servers at A. Datum, implement a new SMTP Receive
connector to receive e-mail messages from the IP addresses assigned to the SMTP servers at Contoso.

B.
On the Exchange Server 2007 Edge Transport servers at A. Datum, modify the Internet Receive connectors
to respond to an EHLO or HELO request with the fully qualified domain name (FQDN) of contoso.com.

C.
On the Exchange Server 2007 Edge Transport servers at A. Datum, configure an SMTP Send connector
with an address space contoso.com. Configure the Send connector to use an Exchange Server 5.5 server at
Contoso as a smart host.

D.
On an Exchange Server 2007 Hub Transport server at A. Datum, add contoso.com as an accepted domain.