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I'm a big fan of iRedMail, which is basically a packaged version of Postfix and the other bits that make Postfix cool, like Spamassassin, greylisting and an LDAP or MySQL backend. One thing I wanted with iRedMail is Mailman, my favourite mailing list server. Integrating the two can be a mission though, so here's some instruction to save you from quite a bit of pain.

Single sign-on is a great technology. Requiring users to login to multiple applications is huge hassle, encourages password reuse and simple passwords. Security needs to focus on usability. If you can make a user's life better while increasing security, everybody wins. In this how-to we will set up the open-source CAS SSO product with the WiKID Strong Authentication Server for two-factor authentication for sessions and mutual https authentication for host authentication. Obviously using two-factor authentication for the login increases security because the user must have the factors to get access, in this case, knowledge of the PIN and possession of the private key embedded in the token. The CAS server is running on Ubuntu 11.04 Server and is using Radius to talk to the WiKID Strong Authentication Server Enterprise Edition.

This tutorial shows how to prepare a CentOS 6.1 x86_64 server for the installation of ISPConfig 3, and how to install ISPConfig 3. ISPConfig 3 is a webhosting control panel that allows you to configure the following services through a web browser: nginx web server, Postfix mail server, MySQL, BIND nameserver, PureFTPd, SpamAssassin, ClamAV, Mailman, and many more. Since version 3.0.4, ISPConfig comes with full support for the nginx web server in addition to Apache; this tutorial covers the setup of a server that uses nginx, not Apache.

This will guide you through the installation of the latest stable version of RoundCube (currently version 0.7) and get it to work together with ISPConfig 3. This guide should work for most Linux distributions but may differ on some parts.

This tutorial shows how to prepare a CentOS 6.1 x86_64 server for the installation of ISPConfig 3, and how to install ISPConfig 3. ISPConfig 3 is a webhosting control panel that allows you to configure the following services through a web browser: Apache web server, Postfix mail server, MySQL, BIND nameserver, PureFTPd, SpamAssassin, ClamAV, Mailman, and many more. Since version 3.0.4, ISPConfig comes with full support for the nginx web server in addition to Apache; this tutorial covers the setup of a server that uses Apache, not nginx.

The main feature or duty of a proxy server could be a gateway that receives HTTP requests from clients and forwards the request to the destination and relays the answer back to the requestor. Squid is most popular open-source software that brings this to us. It also has some excellent features for doing something else such as web access controlling, bandwidth controlling, restriction policies, and content caching and filtering. Actually people install SQUID to pursuit 2 goals: first reduce the bandwidth charges by content caching and second for restricting access to particular contents. The following guide explains advantages of using Squid and will show you how to install, configure, control, and maintain the Squid Proxy Server on RHEL5 and CentOS Linux.

This tutorial shows how to set up file synchronization between two Ubuntu 11.10 servers with Unison. Unison is a file-synchronization tool similar to rsync, but the big difference is that it tracks/synchronizes changes in both directions, i.e., files changed on server1 will be replicated to server2 and vice versa.

Sometimes you need to find out all the dependencies of a package. This tutorial explains how to use apt-rdepends to recursively list all dependencies of a Debian/Ubuntu package.

This tutorial shows how you can enable Compiz on a Linux Mint 12 Lisa desktop (the system must have a 3D-capable graphics card - I'm using an NVIDIA GeForce 8200 here). With Compiz you can use beautiful 3D effects like wobbly windows or a desktop cube on your desktop. Compiz is not supported on GNOME 3 yet, that's why this how-to is applicable only for the classic GNOME desktop.

PDNSD is a non authoritative caching DNS server. It maintains a disk cache of the queries that your system performs and subsequent queries will be faster from the cache. It is safe enough to be used on a personal Unix/Linux system as a home Desktop or a Laptop.

This tutorial shows how you can install and run a Joomla 1.7 web site on a Debian Squeeze or Ubuntu 11.10 system that has nginx installed instead of Apache (LEMP = Linux + nginx (pronounced "engine x") + MySQL + PHP). nginx is a HTTP server that uses much less resources than Apache and delivers pages a lot of faster, especially static files.

Lighttpd is a secure, fast, standards-compliant web server designed for speed-critical environments. This tutorial shows how you can install Lighttpd on a CentOS 6.0 server with PHP5 support (through FastCGI) and MySQL support.

This tutorial shows how you can set up a Pinguy OS 11.10 desktop that is a full-fledged replacement for a Windows desktop, i.e. that has all the software that people need to do the things they do on their Windows desktops. The advantages are clear: you get a secure system without DRM restrictions that works even on old hardware, and the best thing is: all software comes free of charge.

vsftpd is the most popular FTP server in the Linux world and is secure and fast. Recently I had to configure a FTP server quickly onto a CentOS server setup built using the minimal ISO and the server was up and running in a snap.

This article is about how to use the S/MIME encryption function of common e-mail clients to sign and/or encrypt your mails safely. S/MIME uses SSL certificates which you can either create yourself or let a trusted certificate authority (CA) create one for you.

This guide explains how to install Maia Mailguard, a spam and virus management system, on a Debian Squeeze mailserver. Maia Mailguard is a web-based interface and management system based on the popular amavisd-new email scanner and SpamAssassin. Written in Perl and PHP, Maia Mailguard gives end-users control over how their mail is processed by virus scanners and spam filters, while giving mail administrators the power to configure site-wide defaults and limits.

This tutorial shows you how you can install the GNOME 3 desktop on Ubuntu 11.10 with the shell extensions that are used in the Linux Mint 12 release (Lisa) (these shell extensions are called Mint GNOME Shell Extensions - mgse). These shell extensions give GNOME 3 the look and feel of GNOME 2. For those who prefer GNOME 2 this tutorial shows how to install Mate from the Linux Mint repositories on Ubuntu 11.10. Mate is a GNOME 2 fork.

LAMP is short for Linux, Apache, MySQL, PHP. This tutorial shows how you can install an Apache2 webserver on a CentOS 5.7 server with PHP5 support (mod_php) and MySQL support.

This tutorial explains how you can mount a directory from a remote server on the local server securely using SSHFS. SSHFS (Secure SHell FileSystem) is a filesystem that serves files/directories securely over SSH, and local users can use them just as if the were local files/directories. On the local computer, the remote share is mounted via FUSE (Filesystem in Userspace). I will use Ubuntu 11.10 for both the local and the remote server.

This article is about how to create a DVD image of the Ubuntu distribution on your machine with the exact same software included on the disk. This can be done using a software called Remastersys. Remastersys allows you to either create iso-backups of your whole system, including the home folder, or just backups of the installed software, leaving the home folder aside.