• Computerworld - Knowledge Center
  Knowledge Centers - Careers, Software, Security, Wireless, Outsourcing, Mobile, Hardware, Storage, Network & Development
  Come to Computerworld Knowledge Centers to keep up with all the latest news, analysis and opinions on key enterprise technologies and issues.
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• Debian Administration
  Creating a radius based VPN with support for Windows clients
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• Fat On The Lan
  Postfix SpamAssasin ClamAV on Debian
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• HOWTO: Active Directory Authentication [Archive] - Ubuntu Forums
  HOWTO: Active Directory Authentication
  [Archive] HOWTO: Active Directory Authentication Faqs, Howto, Tips & Tricks
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• HowtoForge
  Linux Howtos and Tutorials | The Open Source Howto Development Web Site.
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• Jeffrey Posluns' Postfix Guides
  Postfix Guides
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• My Linux Start Page
  Linux manuals - BG and RU Страници, статии за Linux на български, руски и eng
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• public route server, traceroute and ip border gateway protocol(BGP) tools
  free access to remote routers
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• Search for "cisco" | Scribd
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• The Linux Virtual Server Project
  Linux Server Cluster for Load Balancing
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• Using a self signed SSL Certificates in debian
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• YoLinux
  Index of Linux Tutorials
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• a tons of freeware » xtort.net
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• AMANDA, The Advanced Maryland Automatic Network Disk Archiver
  Amanda - Backup GNU System
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• Diagnosing Forwarding on pptpd
  Diagnosing Forwarding on pptpd
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• Email Blacklist Check
  See if your server is blacklisted
  Online email blacklist lookup check to find out if email server is on any real-time blacklist, spam blacklist or DNS black list commonly used to block email spam
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• Filtering E-Mail with Postfix and Procmail, Part One
  
  This article is the first of three articles that will help systems administrators to implement SMTP daemons and local mail delivery agents to filter out unwanted e-mails before they arrive in the end-users' in-box. Specifically, this series will examine the use of Postfix and Procmail to eliminate spam before it hits the client.
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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 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.
  access address check checks class client example header message postfix recipient reject restriction restrictions sender smtpd
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• frequently used SSL commands
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• Full working server -- install from scratch
  AntiSpam AntiVirus Gateway Email Server using Debian, Postfix, Amavisd-new, SpamAssassin, Razor, DCC, Pyzor and ClamAV
  HOWTO/Guide to set up Debian / postfix / SpamAssassin / Razor / DCC / Pyzor with amavisd-new to filter spam, system-wide
  amavis amavisd amavisd-new anti-spam antispam debian e-mail email filter howto mail postfix relay spam spamassassin spamfilter
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