2. Preliminary installation steps

Before delving into the installation and configuration of all the mail-handling software, we will take a brief look at the operating system that will host it.

As usual, my choice goes to OpenBSD for its proven security, reliability and ease of use. Needless to say, all these features are essential for a system that will have to handle a large volume of email traffic while still making life hard for spammers and malicious users.

We won't cover the installation procedure here, which is documented in full detail on the OpenBSD web site. Just a couple of notes:

Since version 5.4, OpenBSD doesn't start inetd(8) by default, so there are no unnecessary daemons to prevent from running; to modify the server network configuration, please refer to the appropriate chapter in the previous document about redundant firewalls or to the Networking FAQ.