You have an Exchange organization. All servers in the organization have Exchange Server
2010 Service Pack 1 (SP1) installed.
You need to identify why a remote SMTP server rejects e-mail sent from the organization.
What should you do?

A.
Modify the connectivity log settings on the Transport server, and then review the
connectivity logs.

B.
Modify the message tracking settings on the Transport server, and then review the
message tracking logs.

C.
Modify the diagnostic logging level on the MSExchangeTransportService object, and then
review the Application event log.

D.
Modify the protocol logging level on the Send connectors, and then review the protocol
logs.

Explanation:
Protocol logging records the SMTP conversations that occur between e-mail servers as part
of message delivery. These SMTP conversations occur on Send connectors and Receive
connectors configured on servers running Microsoft Exchange Server 2010 that have the
Hub Transport server role or the Edge Transport server role installed. You can use protocol
logging to diagnose mail flow problems.
http://technet.microsoft.com/en-us/library/bb124531.aspx