Updating PHP5-APCu on Ubuntu 14.04 LTS for ownCloud compatibility

If you run your own ownCloud (not the Enterprise version) on Ubuntu 14.04 LTS, you will most likely have noticed that it works but complains on the admin page about APCu being lower than version 4.0.6, which is the version ownCloud 8 and higher needs. Now there is an easy fix to updating PHP5-APCu on […]

Smartphone Battery Myths, Explained

When I named this blog “Random musings, rambling opinions”, I was serious. So I bring you all kinds of interesting (hopefully) posts, ranging from how to secure your computer, to things about atheism, dinosaurs and now smartphone battery myths. Hope this helps someone! Over just a few years, the batteries in our smartphones have changed […]

Hardening Postfix

While there are plenty of good (and not so good) anti-spam solutions available, most of them cost a bit of money in terms of purchasing and licensing fees. Even without a dedicated appliance, there are several ways you can harden the Postfix MTA against spam and other internet nasties. In this article, we’re going to […]

Require TLS for certain domains in Postfix

Recently, I was asked if it was possible to require Transport Layer Security (TLS) for sending email for certain domains, through a specific relay. For added complexity, the list of domains would need to be updated daily. Of course it’s possible, I said. And yes, Postfix is up to the challenge. Here’s how to require […]

Using blacklists with iptables

If you have any kind of system connected to the Internet, you are no doubt aware that no matter how small or unimportant it might seem, it is frequently probed, tested or subject to various attempts at abuse. These attacks come from so many malicious hosts that it is impossible to keep track by hand. […]