In this article we are going to compare some of the most common commands used to manage Ubuntu and Gentoo Linux. Ubuntu and Gentoo are two completely different distributions, but some aspects are comparable, like operations with the packet manager they have: Ubuntu has dpkg, Gentoo has Portage, but on both the systems you’ll want [...]
DomainKeys is an e-mail authentication system designed to verify the DNS domain of an e-mail sender and the message integrity.
Or in simple words: if you don’t use it, yahoo mail systems will hates you (and many many others).
Let’s install and configure dkim-filter:
aptitude install dkim-filter
mkdir /etc/dkim
cd /etc/dkim
dkim-genkey
Edit the default config in /etc/dkim-filter.conf
Domain [...]
Ok, you have a small postfix deployed, and you need a fast but effective protection from third people using your server as a rocket-delivering-spam.
The first thing to do, is to configure the variable mynetworks to allow only certain netblocks to use postfix to send email all over the world:
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 X.X.X.X/XX
Look out: [...]
