Your network contain an Active Directory forest. The forest contains a single domain named contoso.com. The
network contains a legacy mail system that uses a SMTP namespace of contoso.com.
You plan to deploy Exchange Server 2013.
There will be a period of interoperability while the email is migrated from the legacy system to Exchange Server
2013.
During the period of interoperability, you need to ensure that all incoming email is received by an Exchange
Server 2013 server, and then routed to the legacy mail system if an Exchange Server email recipient cannot be
found.
You configure the firewall in the perimeter network to route SMTP traffic to the Exchange Server 2013
organization.
What should you do next?
A.
Modify the existing accepted domain for contoso.com and create a new Send connector.
B.
Add a new external relay accepted domain for contoso.com and create a new Send connector.
C.
Add a new authoritative domain for contoso.com and create a new email address policy.
D.
Add a new internal relay accepted domain for contoso.com and create a new email address policy.
Explanation:
http://technet.microsoft.com/en-gb/library/bb124423(v=exchg.150).aspx
Step 1: Modify accepted domain for contoso.com and make it an internal relay domain.
Step 2: Create a new send connector which routes mail for the contoso.com namespace to the legacy
namespace – if a recipient cannot be found in the Exchange org.