Linux Mail Server Setup and Howto Guide

Services in Linux like cron and kerberos relies on an accurate and synchronized clock. This article describes how to synchronize the system clock with an NTP server.

Ideally, passwords should be changed regularly. This article describes how to setup password expiration using the User Manager application in Red Hat Enterprise Linux 5 or CentOS 5.

This article contains useful links on how to administer a Red Hat Enterprise Linux 5 or CentOS 5 server.

RPMforge is a third party RPM repository for Red Hat Enterprise Linux or CentOS. Adding the RPMforge repository will give you access to an extensive library of precompiled binaries. This article describes how to add the RPMforge repository in Red Hat Enterprise Linux or CentOS 5.

Rsync is a software that synchronizes files and directories using a small amount of data transfers. You can use this to backup data. This page will show you how to use rsync to synchronize files from a source machine.

Webmin is a web-based interface for system administration for Unix. Using any modern web browser, you can setup user accounts, Apache, DNS, file sharing and much more. This article will show you how to install Webmin.

Virtual Network Computing (VNC) is a graphical desktop sharing system which enables you to remotely control another computer. This article will show you how to setup VNC server to remotely manage your Linux machine.

Secure Shell (SSH) is a network protocol that allows data to be exchanged using a secure channel between two computers. SSH is typically used to log into a remote machine and execute commands, but it also supports tunneling, forwarding arbitrary TCP ports and X11 connections; it can transfer files using the associated SFTP or SCP protocols.

vi is a screen-oriented text editor. This is a quick tutorial on how to use vi to enable you to use it immediately.

Red Hat Enterprise Linux 5 and its derivative CentOS 5 includes a graphical tool called Security Level Configuration for configuring the firewall options. This article describes how to use the Security Level Configuration tool to open up the ports necessary for providing an email server.