"Dedicated security appliance that sits between the network firewall and mail servers, including Exchange, to protect against buffer overrun and denial-of-service attacks, virus (using the Sophos anti-virus product), and spam. Monitors for other suspicious activities that might indicate an intrusion. Provides some e-mail policies for incoming and outgoing messages. Uses a hardware accelerator for SSL encryption, without the need to encrypt on every mail server. From Ciphertrust CONTENT"