> The FTP server and IMP cause me the most concerns.... > > Any ideas? Anyone used UML and changed back? UML is not solution here. For security use capabilities system along with chroot environments. Check out http://www.grsecurity.org/papers.php , http://www.openwall.com/linux , man chroot. Of corse dedicated machines for smtp/pop3/imap, web/ftp, sql, dns are better, but still consider using some system wide security system. Andrew.