This is a detailed description about how to set up a Fedora 13 server that offers all services needed by ISPs and hosters: Apache web server
(SSL-capable) with PHP5/Ruby/Python, Postfix mail server with SMTP-AUTH and TLS, BIND DNS server, Proftpd FTP server, MySQL server, Dovecot POP3/IMAP, Quota, Firewall, etc. This tutorial is written for the 64-bit version of Fedora 13, but should apply to the 32-bit version with very little modifications as well. In the end you should have a system that works reliably, and if you like you can install the free webhosting control panel ISPConfig (i.e., ISPConfig runs on it out of the box).

http://www.howtoforge.com/perfect-server-fedora-13-x86_64-ispconfig-2