All Email Security Gateways, all firmware versions.
Barracuda Networks recommends that you implement your security in layers. While the Email Security Gateway, when deployed correctly, will protect your network from incoming email-borne threats, it will not block viruses that invade in other ways, like through web browsers, FTP, IM file transfer, or physical media like CDs or flash drives. The Email Security Gateway will not generally filter email between internal users either - unless the mail server has been configured to relay all internal mail through the Email Security Gateway.
The Email Security Gateway is an important part of any network's defense, but is not a complete virus protection solution in itself. Installing antivirus software on other network devices, including mail servers and workstations, will provide additional layers of security. All Barracuda Networks products are designed to work with other antivirus solutions that may already be in place or may be added in the future.
Barracuda Networks also offers the Barracuda Web Filter and Barracuda IM Firewall to protect your network from other potential means of virus invasion.
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