In this tutorial I will show how you can set up a Postfix mailserver as a backup mail exchanger for a domain so that it accepts mails for this domain in case the primary mail exchanger is down or unreachable, and passes the mails on to the primary MX once that one is up again.

So you are using the killer Amarok music application under Ubuntu, but when you try to "Burn this Album", the menu item is grayed out and otherwise disabled. The reason for this is because Amarok is a KDE application designed to work with K3b, the cd burning application for KDE, but it's not installed by default in Ubuntu. (For that matter, neither is Amarok)

Linux is considered the de-facto server based operating system. A typical Linux distribution comes with everything any web developer could have asked for: php, apache, python, perl, ruby etc. However there is one thing that Linux sorely lacks: Web Development IDEs.

TimeSys has published a second podcast on achieving rapid boots on Linux devices. "Fast boots -- the sequel" discusses the relationship of footprint and boot time, post-2.6.15 kernels' CONFIG_EMBEDDED option, application pre-linking and profiling, filesystem selection, execute-in-place (XIP), and initramfs, among other interesting techniques.

Storage manufacturers are getting ready to start shipping solid state disks, and Linux-based devices like One Laptop per Child's XO and Intel's Classmate don't contain standard hard disks. To improve performance on the wide array of flash memory storage devices now available, project leader Jörn Engel has announced LogFS, a scalable filesystem specifically for flash devices.

Firefox add-ons, or extensions, are small programs that run inside the browser in order to customize some behaviors. In theory, it is possible to develop and maintain a multilingual, multiversion and multiOS Firefox add-on. In practice, there are many obstacles to overcome in order to create and to maintain a working Firefox add-on in one language for one Firefox version and for one OS.

If there's one thing that drives me nuts about the current operating system models is that there is no one single file system that works across all operating systems, fills all the needs of everyone out there and is stable beyond mention to boot. (no pun intended) For Linux there is no less than 30 different file systems.

This article describes how you can monitor your Postfix mailserver with the tools Mailgraph and pflogsumm. Mailgraph creates daily, weekly, monthly, and yearly graphs of sent, received, bounced, and rejected emails and also of spam and viruses, if SpamAssassin and ClamAV are integrated into Postfix (e.g. using amavisd-new).