All servers in your company run Windows Server 2003. You discover that your public IP address is listed on an SMTP blacklist, and that one of your servers is sending unsolicited commercial e-mail that originates from outside your network. You need to ensure that the server does not continue to send the unsolicited commercial e-mail messages.

What should you do?

A.
Configure relay restrictions for the SMTP virtual server.

B.
Configure IPSec rules between the server and the companys Internet gateway.

C.
In the Services console, configure the Log On account settings for the SMTP service.

D.
Enable Internet Authentication Service (IAS) on the server, and configure IAS to be used only by internal network resources.