Your Exchange Server 2007 environment has a single Hub Transport server named Server1. You have a legacy SMTP server. The legacy SMTP server is configured to send e-mail to the Internet through Server1. However, you discover that Internet users are not receiving messages from the legacy SMTP server. You need to ensure that the legacy SMTP server can send e-mail to the Internet through Server1. What should you do?

A.
Update the legacy server to send e-mail messages to Server1 on port 587

B.
Add the IP address of the legacy server to the remote network settings on the Default Server1 Receive connector

C.
Create a new Receive connector, add the Anonymous permission, and then assign the Relay permission to Anonymous users on the Receive connector

D.
Create a new Receive connector, add the Anonymous permission, and then add the IP address of the legacy server to the remote network settings on the Receive connector