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Spam is not only clogging the Internet traffic by consuming a hefty amount of network bandwidth but it is also a source for e-mail born viruses, spyware, adware and Trojan Horses. It is also used to carry out denial of service, directory harvesting and phishing attacks that directly cause financial losses. Further, the contents of spam are often offensive and contain adult oriented and fraudulent materials which are objectionable to recipients. Several anti-spam procedures are currently employed to distinguish spam from legitimate e-mails; however spammers and phishers employ dynamic spam structures to obfuscate email content to circumvent these procedures.
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