You have an Exchange organization. All servers in the organization have Exchange Server 2010 SP1 installed.
You need to prevent external organizations that do not have sender policy framework (SPF) records from sending e-mail messages to the organization.
What should you configure?
A.
Sender reputation.
B.
Sender ID filtering.
C.
An IP block list provider.
D.
Sender filtering.
Explanation:
Reference:http://technet.microsoft.com/en-us/library/aa996295.aspx