Setting up a mail server in Linux

http://rimuhosting.com/support/settingupemail.jsp?mta=postfix

http://en.kioskea.net/contents/300-intranet-installing-a-mail-server

http://ithelpblog.com/os/linux/redhat/fedora/howto-install-and-configure-postfix-mail-server-on-fedora-18/