Email remains the primary attack vector for cyberattacks, with 90% of breaches starting with phishing. This 2026 guide evaluates the best email security gateway solutions.

Threat Landscape 2026

Modern email threats: spear-phishing with AI-generated personalized content, business email compromise (BEC), QR code phishing (quishing), impersonation attacks, malicious URL shorteners, and zero-day malware attachments.

Top Solutions

Microsoft Defender for Office 365: Deep integration with Microsoft 365, ATP Safe Links, Safe Attachments, anti-phishing policies. Best for Microsoft 365 environments.
Google Workspace Security: Built into Google Workspace. AI-powered phishing protection, suspicious link blocking, Vendor Email Compromise (VEC) detection.
Proofpoint Email Protection: Industry-leading threat intelligence, exceptional BEC detection. Industry standard for large enterprises.
Abnormal Security: AI-native with behavioral analysis-based detection. Exceptional at detecting BEC and supply chain attacks.

Conclusion

Microsoft Defender for Office 365 is the best value for Microsoft shops. Proofpoint is the enterprise standard. Abnormal Security excels at detecting AI-generated and sophisticated impersonation attacks.