The DNS and WHOIS systems require the publication of technical contact information for all Internet domains spammers have illegally trawled these resources for email addresses. Spammers have also subscribed to discussion mailing lists for the purpose of gathering the addresses of posters. Simply searching the Web for pages with addresses - such as corporate staff directories or membership lists of professional societies - using spambots can yield thousands of addresses, most of them deliverable. Usenet posts, especially those in archives such as Google Groups, frequently yield addresses. A popular method uses email addresses which their owners have published for other purposes. Spammers may harvest email addresses from a number of sources. Another technique was used in late 2007 by the company iDate, which used email harvesting directed at subscribers to the Quechup website to spam the victim's friends and contacts. Common products and services offered are jokes of the day, daily bible quotes, news or stock alerts, free merchandise, or even registered sex offender alerts for one's area. and any others that are accepted for delivery by the recipient email server, instead of being rejected, are added to the list of theoretically valid email addresses for that domain.Īnother method of email address harvesting is to offer a product or service free of charge as long as the user provides a valid email address, and then use the addresses collected from users as spam targets. Spammers may also use a form of dictionary attack in order to harvest email addresses, known as a directory harvest attack, where valid email addresses at a specific domain are found by guessing email address using common usernames in email addresses at that domain. The simplest method involves spammers purchasing or trading lists of email addresses from other spammers.Īnother common method is the use of special software known as "harvesting bots" or "harvesters", which uses spider Web pages, postings on Usenet, mailing list archives, internet forums and other online sources to obtain email addresses from public data. Typically these are then used for bulk email or spam. The process of collecting email addresses, typically for email spamĮmail harvesting or scraping is the process of obtaining lists of email addresses using various methods.
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