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E-mail harvesting is the process of obtaining lists of e-mail addresses for use in bulk mail or other purposes usually grouped as spam. Methods range from purchasing lists of e-mail addresses from other spammers to the more common use of special software, known as "harvesting software", "harvesting bots" or "harvesters", which scan web pages, postings on Usenet, mailing list archives and other online sources to obtain e-mail addresses. Such software may use regular expression.
Spammers may also use a form of dictionary attack in order to harvest e-mail addresses. For example, a spammer may send messages to adam@example.com, betty@example.com, carl@example.com, etc. Any addresses to which messages are delivered, as opposed to being bounced back, the spammer can then add to his or her sending list.
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