In many states sending spam is illegal. Thus, the spammers have techniques to try and ensure that no one knows they sent the spam out to thousands of users at a time. Which of the following best describes what spammers use to hide the origin of these types of e-mails?


A. A blacklist of companies that have their mail server relays configured to allow traffic only to their specific domain name.
B. Mail relaying, which is a technique of bouncing e-mail from internal to external mails servers continuously.
C. A blacklist of companies that have their mail server relays configured to be wide open.
D. Tools that will reconfigure a mail server's relay component to send the e-mail back to the spammers occasionally.