> I'm looking for a (preferably free) alternative to SME / Clark Connect. > I basically need the following: > > - firewall > - nat > - VPN > - bandwidth limiting / monitoring > - email (SMTP / POP3 / IMAP) & groupware > - file & printer sharing > - RAID support > - if possible fail-over / high availability support. Here is a free mail server solution for RHEL/CentOS 5.x: http://code.google.com/p/iredmail/ -- Best regards. Zhang Huangbin - Open Source Mail Server Solution for RHEL/CentOS 5.x: http://code.google.com/p/iredmail/