The Barracuda Email Security Gateway 300Vx is a robust virtual appliance that operates on popular hypervisors such as VMware ESX, VMware ESXi, Hyper - V, and XenServer. It provides comprehensive inbound and outbound email filtering, email policy management, and email encryption. The appliance includes a Cloud Protection Layer for pre - filtering emails at no additional cost. Key features include LDAP recipient verification, which rejects messages if the recipient's email address is not found in the organization's LDAP directory, as well as per - user quarantine settings, per - domain configurations, clustering capabilities, single sign - on, and SNMP/API tools. The entire system is encapsulated for easy deployment, and configuration is managed through an intuitive web - based user interface, ensuring a seamless experience for administrators.