SonicWall Gateway Anti-Virus (GAV) provides real-time virus protection by scanning all traffic through the SonicWall device. It has no file size limits and can unzip various formats for scanning. GAV checks files against an updated virus database to stop threats before reaching your computers and logs email header information for security analysis.
Gateway Anti-Virus is available under Policy | Security Services | Gateway Anti-Virus. For more information refer to SonicOS 8 Security Services Administration Guide.