Current anti-spam solutions fall into four primary categories: filters, reverse lookups, challenges, and cryptography. Each of these solutions offers some relief to the spam problem, but they also have significant limitations. The first part of this two-part paper looks at filters and reverse lookup solutions. The second part focuses on the various types of challenges, such as challenge-response and computational challenges as well as cryptographic solutions. While there are many different aspects to these solutions, this paper only discusses the most common and significant concerns - this paper is not intended to be a complete listing of implementation options, solutions, and issues.
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