A network administrator is tasked with blocking unwanted spam is being relayed by an internal email
server. Which of the following is the FIRST step in preventing spam that is originating from bots on
the network?
A.
Closing off port 25 on the firewall
B.
Closing off port 53 on the firewall
C.
Turning off the SMTP service on the email server
D.
Turning off the IMAP service on the email server
Port 25 is used by SMTP, blocking that firewall will essentially disabled that service. This would be the first step because it would prevent the propagation of the spam, until a more permanent fix can be applied.