Which of the following would be the best reason for sending a single SMTP message to an address that does not exist within the target company?

A.
To create a denial of service attack.

B.
To verify information about the mail administrator and his address.

C.
To gather information about internal hosts used in email treatment.

D.
To gather information about procedures that are in place to deal with such messages.

Explanation:
The replay from the email server that states that there is no such recipient will also give you some information about the name of the email server, versions used and so on.