- Networking
- Firewall and routing
- Filtering
- NAT and port redirections
- VLAN 802.1Q
- Support for multiple PPPoE and DHCP gateways
- Multi-gateway rules, load balancing and automatic failover
- Traffic shaping (with application layer support)
- Bridged mode
- Graphical traffic rate monitoring
- Network intrusion detection system
- Dynamic DNS client
- Network infrastructure
- DHCP server
- NTP server
- DNS server
- RADIUS server
- VPN support
- Dynamic routes autoconfiguration
- HTTP proxy
- Internet cache
- User authentication
- Content filtering (with categorized lists)
- Transparent antivirus
- Delay pools
- Intrusion Detection System
- Mail Server
- Virtual domains
- Quotas
- SIEVE support
- External account retrieval
- POP3 and IMAP with SSL/TLS
- Spam and antivirus filtering
- Greylisting, blacklisting, whitelisting
- Transparent POP3 proxy filter
- Catch-all account
- Webmail
- Web server
- Certification authority
- Workgroup
- Centralized users and groups management
- Master/slave support
- Windows Active Directory Synchronization
- Windows PDC
- Password policies
- Support for Windows 7 clients
- Network resource sharing
- Groupware: calendar, address book, contacts, etc.
- VoIP server
- Voicemail
- Conference rooms
- Calls through an external provider
- Call transfers
- Call parking
- Music on hold
- Queues
- Logs
- Jabber/XMMP server
- FTP server
- Zentyal User Corner for self users info updating
- Reporting and monitoring
- Dashboard for centralized service information
- Monitor CPU, load, disk space, thermal, memory
- Disk usage and RAID status
- Summarized and full system reports
- Event notification via mail, RSS or Jabber
- Software updates
- Backups (configuration and remote data backup)
Courtesy : http://trac.zentyal.org/wiki/Features