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== Spam and Hoax Email ==
Whilst it is impossible to arrive at exact numbers, it is widely believed that spam email now accounts for as much as 40% of all traffic on the internet. The time employees spend deleting unwanted spam messages is believed to cost businesses in the United States alone in excess of $2 billion. a year in terms of lost productivity.
Clearly spam email messages are a serious issue which must be addressed by system administrators and IT security employees. A number of solutions to the problem are available but none, unfortunately provide 100% certainty of either eliminating all spam, or guaranteeing that legitimate messages will not be incorrectly categorized as spam.
One solution is to subscribe to ''email blacklists''. These are services which maintain a registry of known spam senders which can be used to isolate spam messages. Unfortunately
