IP reputation is a common technique to address email spam problem and while there are commercial implementations available, the algorithms behind them are confidential. A few open source implementations (gossip, RepuScore, IP-GroupREP, etc.) are ...

Web mail providers rely on users to "vote" to quickly and col-laboratively identify spam messages. Unfortunately, spammers have begun to use bots to control large collections of compromised Web mail accounts not just to send spam, but also to vote "not ...

We present in this paper a strategic analysis of spam botnets operations, i.e., we study the inter-relationships among bot-nets through their spam campaigns, and we focus on identifying similarities or differences in their modus operandi. The ...

Spamming botnets present a critical challenge in the control of spam messages due to the sheer volume and wide spread of the botnet members. In this paper we advocate the approach for recipient mail servers to filter messages directly delivered from ...

A new system for spam e-mail annotation by end-users is presented. It is based on the recursive application of handwritten annotation rules by means of an inferential engine based on Logic Programming. Annotation rules allow the user to express nuanced ...

Traditional content-based e-mail spam filtering takes into account content of e-mail messages and apply machine learning techniques to infer patterns that discriminate spams from hams. In particular, the use of content-based spam filtering unleashed an ...

Many bulletin board systems and social network services have become popular collaboration tools in recent years. In such systems, users can easily upload and share their own information via personal computers and mobile phones. However, some information, ...

In many real-world scenarios, we must make judgments in the presence of computational constraints. One common computational constraint arises when the features used to make a judgment each have differing acquisition costs, but there is a fixed total ...

Universal email authentication is impossible with existing authentication schemes, namely DomainKeys Identified Mail (DKIM) and Sender Policy Framework (SPF), primarily because at a minimum this would require the ongoing participation of every domain ...

E-mail sender authentication is a promising way of verifying the sources of e-mail messages. Since today's primary e-mail sender authentication mechanisms are designed as fully decentralized architecture, it is crucial for e-mail operators to know how ...