Setting Up a Mail Server

Link: http://rimuhosting.com/support/settingupemail.jsp?mta=sendmail&t=public

Mail Quick Start

Want the 5 minute email setup guide? These steps will permit a user 'emailusername' to collect email sent to 'emailusername@yourdomain.com'.

1. Setup DNS with an MX record
2. Enable POP3 on your server
3. adduser -s /sbin/nologin emailusername
4. passwd emailusername
5. Set up your email client

IptablesFirewall

Link: http://doc.gwos.org/index.php/IptablesFirewall

HowTo: Set a custom firewall (iptables) and Tips

After getting some problems with firestarter i decided to get knowledge about iptables and how to set my own firewall script and want to share this experience for users who want to set a custom firewall up quickly.
The purpose of this guide is to provide a basic knowledge about iptables and then help to create a firewall script.
The final step will be to make the script running on each boot.

This guide will not talk about NAT things.