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Evict the Spammers from Your Inbox Spamming has become a profitable business, driven by the low cost of sending email compared to other direct marketing techniques. The high return on investment for spammers has resulted in an overwhelming volume of unwanted messages in personal and business email boxes. This article explores how to implement an effective anti spam program.
Dr. Paul Judge,
07/06/2005
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How Spammers Fool Spam Filters Effectively stopping spam over the long-term requires much more than blocking individual IP addresses and creating rules based on keywords that spammers typically use. The increasing sophistication of tools spammers use coupled with the increasing number of spammers in the wild has created a hyper-evolution in the variety and volume of spam. The old ways of blocking the bad guys just don’t work anymore.
Dr. Paul Judge,
07/06/2005
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The Anti Spam Challenge - Minimizing False Positives As costly as spam is, the cost of incorrectly filtering legitimate email is much higher. Whereas some consumer anti spam solutions consider a small number of false-positives to be acceptable, in the business environment achieving zero false-positives is absolutely critical. To address this dilemma companies must explore anti spam solutions that learn and adapt to individual organizations.
Dr. Paul Judge,
07/06/2005
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Anti-Spam Solutions and Security, Part 2 As a brief review from part one of this article series, 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 article looked at filters and reverse lookup solutions. This second part now focuses on the various types of challenge-based systems and 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.
By Dr. Neal Krawetz, 07/13/2004
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Anti-Spam Buyers' Guide A buyers' guide to anti-spam software, this white paper highlights the key features to look for in anti-spam software and why.
By GFI Software, 06/23/2004
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Why Bayesian filtering is the most effective anti-spam technology This white paper describes how Bayesian filtering works and explains why it is the best way to combat spam.
By GFI Software, 06/23/2004
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Filtering E-Mail with Postfix and Procmail, Part Two This article is the second of three articles that will help systems administrators configure SMTP daemons and local mail delivery agents to filter out unwanted e-mails before they arrive in the end-users' in-box. In the first installment, we offered a brief overview of Postfix, and began a discussion of rejecting spam with Postfix by blocking e-mail based on the SMTP client, blocking machines with no reverse DNS, SMTP client map restrictions, DNS blackhole lists, bundling Postfix restriction options, and blocking spam based on SMTP Compliance. In this part, we will look at sender/recipient restrictions, restriction ordering, and map file naming conventions before moving on to Procmail in the final article.
04/16/2004
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Filtering E-Mail with Postfix and Procmail, Part One This article is the first of a three-part series that will help systems administrators to implement the first two methods to filter out unwanted e-mails before they arrive in the end-user's in-box. Server configurations are more powerful and can filter for all users on the system at once, while e-mail client configurations can only protect an individual's right to spam-free e-mail. As systems administrators, most SecurityFocus readers will prefer that the unwanted e-mail doesn't even reach the client at all. Although mail filtering is an option for many STMP servers and delivery agents, this series will only focus on two: Postfix and Procmail, respectively.
04/16/2004
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Email "Spamming" and Email "Spoofing" Email "spamming" refers to sending email to thousands and thousands of users - similar to a chain letter. Spamming is often done deliberately to use network resources. Email spamming may be combined with email spoofing, so that it is very difficult to determine the actual originating email address of the sender. Email spoofing refers to email that appears to have been originated from one source when it was actually sent from another source. Individuals, who are sending "junk" email or "SPAM", typically want the email to appear to be from an email address that may not exist. This way the email cannot be traced back to the originator.
By London School of Economics, 04/08/2004
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What it is, how can it affect us, and how to deal with spam This paper would explore the problem of spam. It would explore its nature and also the reasons why it is a security risk. It would also describe some of the techniques that are currently used to deal with spam including basic technical and policy methodology. This paper intends to be a general-information source to the problem of spam and also provides information of where to get more detailed information about the products that and techniques that describes.
04/05/2004
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