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• Charly's Column

  A partly overloaded DNS server can slow down all the workstations on the network. Dnsgraph is an early warning system that gives administrators a graph of critical values. Your Dnsgraph charts will help you keep your systems serving names.

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• Brave GNU World

  This column looks into projects and current affairs in the world of free software from the perspective of the GNU Project and the FSF. In this issue, we focus on AmavisdNew, a new daemon that operates as a spam filter.

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• Charly's Column

  The Postfix Policyd plugin fights spam using techniques such as greylisting, source detection, volume measurements, blacklisting, and HELO rotation detection.

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• Charly’s Column: SendmailAnalyzer

  During the ongoing battle against spam, admins should inspect their troop’s battle lines from time to time. If you don’t relish the thought of counting the dinnerware, you can use the services of a logfile inspector like SendmailAnalyzer, which works surprisingly well with Postfix and the like.

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• Charly's Column

  At the Niederrhein University future admins implement spam defense mechanisms by attracting the attention of the Viagra Mafia. The results are pertinacious blacklists and expert knowledge of methods for combating the menace.

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