Top 10 Best Email Security Software of 2026

Proofpoint Email Protection is a top-tier cloud-based email security platform designed to defend against advanced threats like phishing, malware, spam, ransomware, and business email compromise (BEC). It employs AI-driven Precision Threat Protection, including URL click-time analysis, attachment sandboxing, and behavioral analysis to detect and block attacks before or after delivery. The solution integrates seamlessly with Microsoft 365, Google Workspace, and other ecosystems, providing detailed threat visibility, DLP controls, and compliance reporting for enterprise-scale protection.

Mimecast Email Security is a cloud-native platform delivering advanced protection against email-based threats like phishing, malware, ransomware, and business email compromise (BEC). It combines AI-driven detection, URL and attachment sandboxing, impersonation defense, and data loss prevention (DLP) to safeguard inboxes. Beyond security, it offers email archiving, continuity, and compliance tools for seamless operations during outages.

Microsoft Defender for Office 365 is a comprehensive cloud-based email security solution designed to protect organizations from advanced email threats like phishing, malware, and business email compromise. It leverages AI and machine learning for real-time detection, scanning emails, attachments (via Safe Attachments), and URLs (via Safe Links) before they reach users. Additional capabilities include anti-impersonation protection, zero-hour auto purge (ZAP), and attack simulation training to enhance security awareness.

Abnormal Security is an AI-native email security platform that protects against advanced threats like business email compromise (BEC), phishing, account takeovers, and malware using behavioral analysis and machine learning. It integrates seamlessly with Microsoft 365 and Google Workspace, providing real-time detection, autonomous remediation, and post-delivery protection without relying on traditional signatures or sandboxing. The platform excels in identifying anomalous user behaviors and intent behind emails, achieving high accuracy with minimal false positives.

IRONSCALES is an AI-powered email security platform specializing in phishing protection and threat remediation for enterprises. It combines machine learning with human intelligence to detect sophisticated attacks, offering autonomous response capabilities that automatically quarantine malicious emails. The solution also includes integrated user awareness training, threat hunting tools, and detailed analytics to strengthen overall email defenses.

Barracuda Email Security is a robust platform designed to protect organizations from email-based threats including spam, phishing, malware, and ransomware through AI-driven filtering and global threat intelligence. It provides inbound/outbound email protection, data loss prevention, encryption, and archiving capabilities, available as a cloud service or on-premises appliance. The solution integrates with Microsoft 365, Google Workspace, and other email systems for seamless deployment and management.

Cisco Secure Email Threat Defense (ETD) is a cloud-native email security gateway that delivers advanced protection against phishing, malware, ransomware, and business email compromise (BEC) using AI, machine learning, and Cisco Talos threat intelligence. It scans inbound, outbound, and internal email traffic in real-time with features like URL defense, attachment sandboxing, and impersonation detection. ETD integrates seamlessly with Microsoft 365, Google Workspace, and Cisco's SecureX platform for unified threat management and rapid response.

Check Point Harmony Email & Collaboration is a cloud-delivered security platform designed to protect email and SaaS collaboration applications like Microsoft 365 and Google Workspace from sophisticated threats such as phishing, malware, ransomware, and business email compromise. It employs AI/ML-driven detection, real-time sandboxing, behavioral analysis, and DLP to block attacks before they reach users. The solution provides unified visibility and management across email ecosystems, integrating seamlessly with existing cloud environments.

Trend Micro Email Security is a cloud-based platform that protects organizations from email threats like phishing, spam, malware, ransomware, and business email compromise (BEC). It uses AI-driven machine learning, behavioral analysis, and sandboxing to detect and block advanced persistent threats in real-time. The solution integrates seamlessly via API with Microsoft 365, Google Workspace, and other email systems, eliminating the need for MX record changes.

Sophos Email Protection is a cloud-native email security gateway that safeguards inboxes from spam, phishing, malware, ransomware, and business email compromise (BEC) attacks. It employs AI-driven engines, SophosLabs threat intelligence, and sandboxing for attachments and URLs to detect both known and zero-day threats in real-time. Designed for integration with Microsoft 365, Google Workspace, and on-premises systems, it offers policy-based filtering, data loss prevention (DLP), and detailed reporting within the Sophos Central management console.