<P> Email spam, also known as junk email, is unsolicited messages sent in bulk by email (spamming). </P> <P> Most email spam messages are commercial in nature . Whether commercial or not, many contain disguised links that appear to be for familiar websites but in fact lead to phishing web sites or sites that are hosting malware . Spam email may also include malware as scripts or other executable file attachments (trojans). Spam is named after Spam luncheon meat by way of a Monty Python sketch in which Spam is ubiquitous, unavoidable and repetitive . </P> <P> Email spam has steadily grown since the early 1990s . Botnets, networks of virus - infected computers, are used to send about 80% of spam . Since the expense of the spam is borne mostly by the recipient, it is effectively postage due advertising . This makes it an excellent example of a negative externality . </P>

Where does all the spam email come from
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