Your company has a main office and a branch office.
The network contains an Exchange Server 2003 server named Server1 in the main office and a server that runs IMAP4 and SMTP in the branch office.
All e-mail messages from the Internet are delivered to Server1.
The organization has only the default recipient policy applied. All users have e-mail addresses with a contoso.com Suffix.
You need to ensure that all messages sent to the contoso.com address that cannot be delivered to Server1 are sent to the branch office server.
What should you do?
A.
In the external DNS zone, configure an MX record that points to the branch office server.
B.
On Server1, create a SMTP virtual server that uses the branch office SMTP server as a smart host.
C.
On Server1, configure the default SMTP virtual server to forward all e-mail messages that have unresolved recipients to the branch office server.
D.
On Server1, create a SMTP connector that has an address space of contoso.com. Configure the connector to use the branch office server as a smart host.