Best Integrated Cloud Email Security (ICES) Tools

Avanan is an email security product now sold under Check Point’s Harmony Email Security line, focused on protecting Microsoft 365 and adjacent collaboration channels from phishing, business email compromise, malware, ransomware, and data leakage. It deploys as a cloud app with no MX-record change and is positioned for organizations that want inline and post-delivery controls without replacing their existing mail stack. Its main fit is for Microsoft 365 customers that need layered protection beyond native filtering, including account-compromise and data-loss controls.

Barracuda is a leading cybersecurity company providing complete protection against complex threats

Cisco Umbrella is a cloud-delivered Security Service Edge (SSE) solution that enforces zero trust by continuously verifying identity, device posture, and context before granting access to applications. It converges multiple security functions, secure web gateway, firewall-as-a-service, cloud access security broker, and zero trust network access, into a unified cloud platform. Cisco Umbrella serves enterprises requiring distributed security across remote workers, branch offices, and on-premises infrastructure without complete network architecture overhauls.

Graphus is a cloud email security product focused on Microsoft 365 and Google Workspace tenants. It detects phishing, spoofing, business email compromise, account takeover, malware, and ransomware attempts, then quarantines suspicious mail and warns users before they interact with it. The product is positioned for organizations that want API-based deployment without MX record changes, mail rerouting, or agents, and for MSPs or IT teams that need automated inbox protection with minimal operational overhead. It is offered as an anti-phishing and email-borne threat defense layer rather than a full secure email gateway replacement.

GreatHorn is a cloud email security platform focused on detecting and remediating phishing, business email compromise, impersonation, credential theft, account takeover, malicious URLs, and payloads in Microsoft 365 and Google Workspace environments. It is positioned for enterprises that need post-delivery search-and-removal workflows, inbox-level remediation, and integration into broader security operations. GreatHorn is best suited for organizations that want to reduce manual phishing response across complex mail environments and connect email incidents to SOAR and SIEM tools.

IRONSCALES is an AI-driven email security platform designed to detect and remediate advanced phishing, Business Email Compromise (BEC), and account takeover (ATO) attacks. It utilizes a hybrid approach combining machine learning algorithms with crowdsourced human intelligence to provide a decentralized self-learning system. The platform integrates via API with Microsoft 365 and Google Workspace, replacing or augmenting traditional SEGs with an Integrated Cloud Email Security (ICES) architecture.

Microsoft Defender for Cloud is a multicloud CSPM platform that provides continuous security posture assessment across Azure, AWS, and GCP. It delivers agentless vulnerability scanning, misconfiguration detection, and compliance monitoring against industry benchmarks (CIS, NIST, ISO, PCI-DSS). The platform generates hardening recommendations ranked by risk and includes attack path analysis to identify exploitable chains. Defender for Cloud serves enterprises managing hybrid and multicloud infrastructure seeking unified posture visibility and compliance reporting.

FortiMail Workspace Security delivers AI-powered protection for email, browsers, collaboration, and cloud apps across the modern workspace

SlashNext is an email security vendor focused on stopping phishing, business email compromise, credential theft, and QR-code-based attacks before they reach users. Its cloud email security products use predictive detection techniques rather than relying only on signatures or delayed reputation feeds, and the company has been positioned as a strong specialist in advanced social-engineering defense. It is best suited for organizations that want protection for Microsoft 365 and other enterprise email environments against zero-hour email threats. SlashNext also sells adjacent messaging-security capabilities, but those are outside this profile scope.

StrongestLayer is an LLM-native email security platform designed to combat the surge in sophisticated, AI-generated phishing and social engineering attacks. Unlike legacy SEGs that rely on signatures or basic heuristics, it uses deep language modeling to understand intent and context within communications. The platform integrates via API to provide real-time scanning and "in-the-moment" user coaching to improve organizational resilience.

Sublime Security is the adaptive, AI-powered cloud email security platform that combines best-in-class effectiveness with unprecedented visibility and control. The open platform allows security teams to have transparency and flexibility in their email environment to spend less time on email-originated incidents. Advanced teams can customize detections, threat hunt, extend Sublime into their SIEM or SOAR, and collaborate with other teams.