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This document describes how to install a Postfix mail server that is based on virtual users and domains, i.e. users and domains that are in a MySQL database. I will also demonstrate the installation and configuration of Courier (Courier-POP3, Courier-IMAP), so that Courier can authenticate against the same MySQL database Postfix uses. In addition to that, this tutorial covers the installation of Amavisd, SpamAssassin and ClamAV so that emails will be scanned for spam and viruses. I will also show how to install SquirrelMail as a webmail interface so that users can read and send emails and change their passwords.

When looking at the AMD Phenom 9500 under Linux, we had found this processor had posed a number of issues from kernel panics to other troubles when running Ubuntu 7.10 with the Linux 2.6.22 kernel. Once, however, upgrading to Ubuntu 8.04 with the Linux 2.6.24 kernel these problems had vanished and we were pleased by this native quad-core desktop processor from AMD. Released a month prior to the first Phenom desktop CPUs were the quad-core Opteron 2300 "Barcelona" processors. We hadn't looked at any AMD Barcelona processors at that time, but today we finally have our hands on two of the new AMD Opteron 2356 server/workstation processors.

You may recall about 4 months ago, I reviewed the Eee PC. As it turned out, the computer was actually a gift from my wife, so unlike many of the other products I review, I got to keep it. I'm going to give you the quick rundown of how those 4 months have been with the little lappy at my side:

Free operating systems differ from the proprietary variety in a number of ways. One of the differences which is most evident to all users is in the provision of device drivers. With free systems, device drivers are free software, provided with the system itself. Proprietary systems tend to provide relatively few drivers; instead, proprietary drivers are shipped with the hardware itself and installed separately. Anybody who wonders about which model works better would be well advised to look at the events of March 28, when Creative Labs shut down an outside developer who had been working to improve Creative's drivers.

Ever want to boot up your Ubuntu Linux system really quick to look something up? Sure, I think we all do that from time to time. Hate it when you get the forced file system check because you’ve booted up 30 times? I do. Imagine how I felt in front of a room full of young students, who were attending a small business seminar when this “lengthy” check kept us waiting, while listening to them snigger and giggle. (”Windows doesn’t do this”, “…that’s a cheap OS…”, “Get a real OS”, “…hurry up man…”, “…slooooowwwww…”, “…Linux sucks…”, and so on).

Linux does everything that many users want it to, but some people have tasks that require Windows applications. You can dual-boot both operating systems, or run Windows in a virtualized environment on Linux. Alas, virtualization makes the guest OS almost useless for processor- and RAM-intensive tasks like editing videos and playing games. Now, a Ubuntu-based distro called andLinux takes cooperation with Windows to a whole new level.

I recently ran into trouble trying to play copy-protected DVDs on my new installation of Kubuntu 8.04 (Hardy Heron beta). Initially it seemed that there was a problem with the installation of libdvdcss2, because Kaffeine kept offering to re-install it. However, after a re-start of Kaffeine from Konsole with wizard mode (kaffeine -w), I got this error...

The Debian GNU / Linux distribution has announced the eighth and final update to the Debian 3.1 Sarge release. Time sure does fly. It seems like just yesterday that I was complaining about the delayed Sarge release (it was actually 2004), and wondering what impact the upstart Ubuntu distribution would have on Debian.

Via Technologies has laid out a new initiative to improve support for the open source development community. The chip maker will launch an official Via Linux website this month as a first step in the programme.

In about 100 days, the United States Federal Government will be required to be running large portions of their systems on IPv6. Now, for the few non-technical in the crowd, it means that the address your PC uses to connect to the Internet, in most cases, is IPv4.

UNIX, Novell, Red Hat and Ubuntu Linux were the most reliable server operating systems. Linux distributions experienced 1-2 hours per server per annum downtime, an average decrease of 75% since 2006. Surprisingly, downtime increased by 25% to nearly 9 hours per server, per year for Windows Server 2003.

The International Organization for Standardization has called for "personal attacks" to cease in the debate surrounding Microsoft's Office Open XML standard. The move came as an ISO committee meeting in Norway attracted protesters, who gathered to call for the retraction of Open Office XML (OOXML) from the ISO standardization process.

Microsoft Corp.'s operating systems run most personal computers around the globe and are a cash cow for the world's largest software maker. But you'd never confuse a Windows user with the passionate fans of Mac OS X or even the free Linux operating system. Unless it's someone running Windows XP, a version Microsoft wants to retire.

Learn what's involved when introducing a Linux client pilot in your organization, including planning for business and IT requirements, architecture decisions, risks, and understanding how IBM's open collaboration client is used to implement this desktop of the future, today.

Several PAM modules exist which incur loss of information whenever the password is no longer available. The problem is presented and a possible solution is suggested.

Jeremiah Gray wants to provide an interesting way to learn about Linux, so he's created a new comic strip, called Hackett and Bankwell, about the open source operating system. The strip will be published as a series of comic books that Gray hopes will appeal to new Linux users, but he says it is "more than just a comic book version of a Linux training guide."

If you click this link, you can see my house. That vehicle in the driveway is my 1991 Ford Ranger. I give you that link without hesitation, because with the current state of technology, it's a simple point and click to get my address, and a copy/paste after that to get a map. I'm not so naive that I consider an unlisted phone number viable protection from the prying eyes of the world. Does that mean privacy is dead? Well, I'd argue yes and no.

Attention computer animators -- if you've ever felt limited by working in three dimensions with tools like Blender, check out Pencil, an open source, cross-platform animation app that lets you create in glorious 2-D. Pencil mimics hand-drawn animation techniques, but it's easy to use and produces high-quality output. You can download source code packages as well as pre-built binaries for Ubuntu, Arch Linux, Windows, and Mac OS X. The latest release is 0.4.4b for Macs and Windows boxes, and 0.4.3b for Linux. The differences between the two versions are minor, but include a change to the file format, so if you run Pencil on multiple platforms, you may want to stick with 0.4.3b until the Linux build is updated.

Keeping the files on multiple machines synchronized seems to be a recurring problem for many computer users. Until I discovered Unison (http://www.cis.upenn.edu/~bcpierce/unison/) I never really had a completely satisfactory solution. What we'd like to be able to do is efficiently keep two or more servers completely synchronized with each other no matter what gets changed on any of the servers. In the simplest case, we have a production server and a backup server that we need to keep in sync. We might have a cluster of servers used in a load balancing configuration. In the worst case, we might have a group of computers where changes are occurring on any or all of the devices. Consider the case where we have a computer at the office, a laptop, and a work computer at home. We want to be able to work from any computer at any time.

Linux is not just good for programming and system administration. PolishLinux.org has an article listing top 27 educational tools for you and your kids to learn maths, chemistry, geography, astronomy and languages and type-writing.