DSPAM is a free software statistical spam filter written by Jonathan A. Zdziarski, author of the book Ending Spam (ISBN 1593270526). It is intended to be a scalable, content-based spam filter for large multi-user systems. DSPAM is distributed under the terms of the GNU General Public License Code complete redirects here. ... is the 78th day of the year (79th in leap years) in the Gregorian calendar. ... Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era in the 21st century. ... An operating system (OS) is the software that manages the sharing of the resources of a computer and provides programmers with an interface used to access those resources. ... Diagram of the relationships between several Unix-like systems A Unix-like operating system is one that behaves in a manner similar to a Unix system, while not necessarily conforming to or being certified to any version of the Single UNIX Specification. ... Computer software can be organized into categories based on common function, type, or field of use. ... A mail filter is a piece of software which takes an input of an email message. ... A software license is a legal agreement which may take the form of a proprietary or gratuitous license as well as a memorandum of contract between a producer and a user of computer software. ... The GNU logo For other uses of GPL, see GPL (disambiguation). ... A website (alternatively, Web site or web site) is a collection of Web pages, images, videos or other digital assets that is hosted on one or several Web server(s), usually accessible via the Internet, cell phone or a LAN. A Web page is a document, typically written in HTML... Clockwise from top: The logo of the GNU Project, the Linux kernel mascot Tux, and the BSD Daemon Free software is software that can be used, studied, and modified without restriction, and which can be copied and redistributed in modified or unmodified form either without restriction, or with restrictions only... A mail filter is a piece of software which takes an input of an email message. ... It has been suggested that this article or section be merged with Scale (computing). ... Multi-user is a term that defines an operating system that allows concurrent access by multiple users of a computer. ... The GNU logo The GNU General Public License (GNU GPL or simply GPL) is a widely-used free software license, originally written by Richard Stallman for the GNU project. ...

The project consists of a library, libdspam, which contains the core filtering and storage routines, and command-line and web-based interfaces. DSPAM is MTA-independent, can store spam classification data in a number of database formats, and uses bayesian filtering to learn and adapt to spam. Illustration of an application which may use libvorbisfile. ... A command line interface or CLI is a method of interacting with a computer by giving it lines of textual commands (that is, a sequence of characters) either from keyboard input or from a script. ... HTTP (for HyperText Transfer Protocol) is the primary method used to convey information on the World Wide Web. ... A mail transfer agent or MTA (also called a mail transport agent, mail server, or a mail exchanger in the context of the Domain Name System) is a computer program or software agent that transfers electronic mail messages from one computer to another. ... This article is about computing. ... Bayesian filtering is the process of using Bayesian statistical methods to classify documents into categories. ...

DSPAM's author claims that typical users of DSPAM have reported from 99.5 to 99.95% accuracy, including "best recorded levels of accuracy ... 99.991% by one avid user (2 errors in 22,786) and 99.987% by the author."^[1] However, at the spam filter test performed at TREC 2005^[2] the best-performing DSPAM configuration had misclassification rates significantly worse than the leading filters in the test and far below stated levels of accuracy. The Text REtrieval Conference (TREC) is an on-going series of workshops focusing on a list of different information retrieval (IR) research areas, or It is co-sponsored by the National Institute of Standards and Technology (NIST) and Advanced Research and Development Activity (ARDA) center of the U.S. Department...

References

1. ^ DSPAM official site, Introduction.
2. ^ Spam Track Overview (2005) - TREC 2005

The Text REtrieval Conference (TREC) is an on-going series of workshops focusing on a list of different information retrieval (IR) research areas, or It is co-sponsored by the National Institute of Standards and Technology (NIST) and Advanced Research and Development Activity (ARDA) center of the U.S. Department...

External links

• DSPAM home page
• DSPAM documentation wiki
• IT Managers Journal - How DSPAM is helping de-spam email boxes (2004)