You have an Exchange Server 2010 organization.
An Edge Transport server sends and receives all e- mail messages from the Internet.
You notice that some servers on the Internet identify e-mail messages from your organization as spam. You need to minimize the possibility that e-mail messages sent from your organization are identified as spam.
What should you do?()
A.Implement Microsoft Forefront Security for Exchange Server.
B.Create SenderID TXT records for the Edge Transport servers.
C.Configure the Edge Transport servers to use a real-time block list (RBL).
D.Install a server certificate from a trusted third-party certification authority (CA).