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Spam
E-mail spam has existed since the beginning of the Internet, and has grown to about 90 billion messages a day, although about 80% is sent by fewer than 200 spammers. Bot nets, virus infected computers, account for about 80% of spam. Laws against spam have been sporadically implemented, with some being opt-out laws and others being opt-in. The total amount of spam has levelled off slightly in recent years. The cost of spam is borne mostly by the recipient, so it is a form of postage due advertising.
E-mail addresses are collected from chat rooms, web sites, newsgroups, and viruses which harvest users address books, and are sold to other spammers. Much of the traffic is sent to invalid e-mail addresses. ISP's have attempted to recover the cost of spam through lawsuits against spammers, although they have been mostly unsuccessful in collecting damages despite winning in court.
There are ways of hiding your email address from spammers.