SonicWall E-Class Email Security Appliance (ESA) 4300 offers comprehensive, effective and scalable email security for enterprise environments. Powerful yet easy to manage, the ESA 4300 combines anti-spam, anti-virus and anti-phishing capabilities with content filtering and outbound email management, preventing leaks of confidential information and violations of regulatory compliance laws. Its unique pre-emptive scanning Mail Transfer Agent (MTA) offers breakthrough message analysis and industry-leading message delivery rates, providing higher performance and enterprise-wide scalability.