Webopedia's "Did You Know...?" Article - Getting Rid of Spam
Spam has become ubiquitous - one of the facts of life, like taxes. Until strong anti-spam laws are passed and actually enforced, spam proliferation will continue because it's proven to reach a mass audience. If it didn't work, spammers wouldn't waste their time.

Webopedia's "Did You Know...?" Article - The History of the @ Sign
In 1972, Ray Tomlinson sent the first electronic message, now known as e-mail, using the @ symbol to indicate the location or institution of the e-mail recipient. Tomlinson, using a Model 33 Teletype device, understood that he needed to use a symbol that would not appear in anyone's name so that there was no confusion.

Webopedia's "Did You Know...?" Article - Why E-Mails Bounce
In computer jargon, a bounced e-mail is one that never arrives in the recipient's inbox and is sent back, or bounced back, to the sender with an error message that indicates to the sender that the e-mail was never successfully transmitted. But what happens when someone sends an e-mail out into cyberspace, and why do e-mails sometimes bounce back?