Cybonet Outbound Spam Guard (OSG) is a carrier-grade solution designed to scan and block outbound spam and malicious email traffic for Internet Service Providers (ISPs) and Service Providers. The OSG operates as a transparent proxy, intercepting outbound SMTP traffic without requiring changes to existing infrastructure. It is capable of handling 2+ Class B subnets and 10,000+ SMTP sessions per second on a standard 1U server, enabling it to process billions of messages daily while managing peak botnet burst traffic. Core protection is based on multi-layer screening using botnet behavioral characteristics, supplemented by CYBONET Sub Layer IP Screening Technology and a recurrent pattern detection content inspection engine. This behavioral approach minimizes false positives compared to deep content inspection methods. The OSG provides real-time visibility into outbound SMTP traffic, identifying infected IP addresses or hosts within the provider's network that are under botnet control. Granular reporting and statistics allow Service Providers to quickly identify and neutralize infected endpoints. Deployment options include software installation compatible with virtual platforms such as VMware, Hyper-V, and Citrix XenServer, in addition to standard 1U hardware. Key operational benefits include: - Blocking up to 99.8% of outbound spam to protect IP and ISP reputation - Prevention of IP blacklisting - Port 25 management for visiting organizations using their own email systems - Improved bandwidth efficiency by reducing spam-related traffic