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Spam email delivery
Since Internet users and system administrators have deployed a vast array of techniques to block, filter, or otherwise banish spam from users' mailboxes and almost all Internet service providers forbid the use of their services to send spam or to operate spam-support services, special techniques are employed to deliver spam emails. Both commercial firms and volunteers run subscriber services dedicated to blocking or filtering spam.〔(Proof of Work can Work )〕
==Webmail==
A common practice of spammers is to create accounts on free webmail services, such as Hotmail, to send spam or to receive e-mailed responses from potential customers. Because of the amount of mail sent by spammers, they require several e-mail accounts, and use web bots to automate the creation of these accounts.
In an effort to cut down on this abuse, many of these services have adopted a system called Captcha: users attempting to create a new account are presented with a graphic of a word, which uses a strange font, on a difficult to read background. Humans are able to read these graphics, and are required to enter the word to complete the application for a new account, while computers are unable to get accurate readings of the words using standard OCR techniques. Blind users of captchas typically get an audio sample.
Spammers have, however, found a means of circumventing this measure. Reportedly, they have set up sites offering free pornography: to get access to the site, a user displays a graphic from one of these webmail sites, and must enter the word. Spammers can equip pornography-carrying emails (and any email type in general) to enter searches into the search engine so a larger amount of windows can be opened. For example, by simply inputing the word "porn" into Google's search engine, spam messages can open up several sites related to the word "porn." These messages make it very hard to trace the spammer as the search word(s) make it appear as if the spam receiver entered the word themselves. The search word will not appear in the recent searches and the windows will not appear in the History page unless a link is clicked on the site. Some porn-emails will link to specific sites and ask for the user to create an account and enter payment information. Once the user has successfully created the account, the user gains access to the pornographic material.〔(Spammers turn to free porn to beat Hotmail security )〕 Furthermore, standard image processing techniques work well against many Captchas.〔(Using Machine Learning to Break Visual Human Interaction Proofs (HIPs) )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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