This is a detailed description about how to set up a Fedora Core 6 based server that offers all services needed by ISPs and hosters: Apache web server (SSL-capable), Postfix mail server with SMTP-AUTH and TLS, DNS server, FTP server, MySQL server, POP3/IMAP, Quota, Firewall, etc.
http://www.howtoforge.com/installing_a_lamp_system_with_fedora_core_6