Spam remains a growing problem in cyberspace. According to Ferris Research, which studies messaging and content control, 40 trillion spam messages will be sent in 2008, compared to 18 trillion in 2006 and 30 trillion in 2007.
In theory, email filtering software and appliances allow ‘good’ or ‘true’ email messages to pass through while prohibiting spam. But filters are not fool-proof and can on occasions mistakenly allow spam to pass through, believing it to be true email (known as a false negative), or they can mistakenly block true email, believing it to be spam (a false positive). 8 tips to filter spam effectively News - PC Advisor
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