Effective email security requires a layered approach, as threats range from phishing and ransomware to business email compromise and data loss. While most secure email gateways can block known threats, advanced protection is needed against zero-day exploits through behavioral analysis and anomaly detection. Strong solutions should also include outbound scanning for data loss prevention, encryption, advanced image inspection, antivirus integration, sandboxing, and real-time URL validation. To counter blended threats, intelligence-driven defenses backed by expert research are essential. Trustwave MailMarshal leverages SpiderLabs threat intelligence, achieving over 99.9 percent spam reduction and maintaining a 20-year record without major incidents.

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