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Operating System

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The mail server is built upon the CentOS operating system, a free distro based upon RedHat Enterprise Linux.

A nice distro to use for the server is CentOS. It's built upon Redhat Enterprise Linux so it provides a "Redhat" style distro while being stable and well-tested. A more "cutting-edge" distro such as Ubuntu or Fedora aren't stable enough for practical use as a server – too many updates being regularly pushed out.

Installation
The CentOS Guide has installation instructions.

Be sure to install Development Tools and NTP daemon.