[简答题]About forty percent of all email traffic in the United States is spam, and this figure is climbing rapidly. Spam is usually defined as unsolicited, mass commercial email. It is often associated with advertisements for pornographic websites, drugs, or surgery that can enhance your sex life. Within another year or so, industry experts predict, half of all email messages will be unsolicited.
The flood of email marketing causes headaches for email users. Additionally, it costs corporations billions of dollars and reduces employee productivity. According to a recent study, the average employee spends almost seven minutes per day handling an average of 13 spam messages. This translates to major corporate losses. The annual cost of spam has reached $ 9 billion for US corporations alone.
Perhaps worst of all, spare baffles anti-spammers, who haven’t vet come up with a solution to this growing problem, in fact, the only proven way to stop spam is not to have an email address.

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