Top 10 Best Email Filtering Software of 2026

Proofpoint Email Protection is a leading enterprise-grade email security solution that delivers advanced filtering against spam, phishing, malware, ransomware, and business email compromise (BEC) using AI-driven detection and behavioral analysis. It integrates seamlessly with Microsoft 365 and other platforms, offering features like URL and attachment sandboxing, precise threat intelligence, and automated response capabilities. The platform emphasizes people-centric security, protecting users from account takeover and impersonation attacks while ensuring compliance through DLP controls.

Mimecast Email Security is a cloud-native platform delivering advanced email threat protection, including AI-driven detection of phishing, malware, ransomware, and business email compromise. It features multi-layered defenses like URL and attachment sandboxing, impersonation protection, and DMARC monitoring to safeguard inboxes across Microsoft 365 and Google Workspace. Beyond filtering, it integrates archiving, continuity, and compliance tools for enterprise-grade email management.

Microsoft Defender for Office 365 is an advanced cloud-based email security solution designed to protect organizations from phishing, malware, spam, and business email compromise attacks. It leverages AI-driven detection, machine learning, and behavioral analysis to scan emails, attachments, and links in real-time, preventing threats from reaching user inboxes. Integrated natively with Exchange Online and Microsoft 365, it offers features like Safe Attachments, Safe Links, and anti-impersonation protection for comprehensive email filtering.

Barracuda Email Security Gateway is a robust cloud-based and on-premises email security solution designed to protect organizations from spam, phishing, malware, ransomware, and advanced email threats using AI-driven machine learning and behavioral analysis. It provides multi-layered filtering, data loss prevention (DLP), email encryption, archiving, and continuity features to ensure secure and compliant email operations. With flexible deployment options including virtual appliances and hardware gateways, it integrates seamlessly with Microsoft 365, Google Workspace, and other platforms.

Abnormal Security is an AI-powered email security platform designed to protect organizations from advanced email threats like phishing, business email compromise (BEC), account takeovers, and malware. It leverages behavioral AI and machine learning to analyze email patterns, sender relationships, and anomalies in real-time, surpassing traditional signature-based filters. The solution integrates natively with Microsoft 365 and Google Workspace, offering automated remediation and detailed forensic reports.

IronScales is an AI-powered email security platform designed to combat phishing, business email compromise (BEC), and other advanced email threats through a combination of machine learning and human intelligence. It offers real-time detection, autonomous remediation, and user-empowered reporting to minimize false positives and enhance organizational resilience. The solution integrates seamlessly with Microsoft 365 and Google Workspace, providing continuous threat hunting and simulated phishing training.

Cisco Secure Email Threat Defense is a cloud-based email security solution that provides advanced protection against phishing, malware, ransomware, and business email compromise (BEC) threats. Leveraging Cisco Talos global threat intelligence and AI/ML-driven detection engines, it scans inbound, outbound, and internal emails in real-time, including sandboxing for attachments and URLs. The platform integrates seamlessly with Microsoft 365 and other ecosystems, offering policy management, incident response, and reporting for enterprise-scale deployments.

Trend Micro Email Security is a cloud-based email filtering solution that protects against spam, phishing, malware, ransomware, and advanced threats using AI, machine learning, and global threat intelligence. It scans inbound, outbound, and internal emails in real-time, with features like sandbox analysis, URL filtering, and attachment detonation. The service integrates seamlessly with Microsoft 365, Google Workspace, and on-premises systems, providing compliance tools and detailed reporting for enterprise environments.

Fortinet FortiMail is a robust email security gateway that provides advanced protection against spam, viruses, phishing, and malware using AI-driven machine learning and FortiGuard threat intelligence. It offers data loss prevention (DLP), email encryption, archiving, and sandboxing for zero-day threats, supporting both on-premises appliances and cloud deployments. Designed for scalability, it integrates seamlessly with the Fortinet Security Fabric for unified threat management across networks.

SpamTitan is a cloud-based email security gateway that provides robust protection against spam, phishing, malware, viruses, and business email compromise (BEC). It leverages advanced AI, machine learning, heuristics, and sandboxing to achieve over 99.9% spam detection rates with minimal false positives. The solution supports inbound/outbound filtering, email archiving, encryption, and compliance features, making it suitable for businesses of all sizes seeking reliable email defense.