The Barracuda Email Security Gateway Vx is a virtual appliance supported on popular hypervisors such as VMWare ESX, VMWare ESXi, Hyper-V, and XenServer. Features include inbound and outbound email filtering, email policy management, email encryption and pre-filtering in the cloud (Cloud Protection Layer) for no additional charge. The Barracuda Email Security Gateway Vx also offers the ability to reject messages if the recipient's email address does not appear in organization's LDAP directory. Along with LDAP recipient verification, the Barracuda Email Security Gateway offers per-user quarantine and settings, per-domain settings, clustering, single sign-on, and SNMP/API tools. The entire virtual appliance including hardware configuration, operating system and application modules are encapsulated for easy deployment. Once the virtual appliance is installed, configuration, and administration is through the same intuitive Web based user interface on the physical appliance.