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Sublime Security Sublime Rules is a free email security platforms tool by Sublime Security. Fortinet FortiMail Email Security is a commercial email security platforms tool by Fortinet. Compare features, ratings, integrations, and community reviews side by side to find the best email security platforms fit for your security stack.
Based on our analysis of NIST CSF 2.0 coverage, core features, integrations, company size fit, here is our conclusion:
Sublime Security Sublime Rules
Security teams running Microsoft 365 or Google Workspace who need to stop BEC and credential phishing without adding another paid platform should start with Sublime Security Sublime Rules. The detection logic is built on Message Query Language rules that actually catch HTML smuggling and OneNote malware where signature-based filters fail, and you get DLP discovery rules included at zero cost. Skip this if your org needs automated response or investigation workflows; Sublime Rules is detection-only and assumes you have a process to act on what it finds.
Fortinet FortiMail Email Security
Mid-market and enterprise teams defending Microsoft 365 or Google Workspace environments should prioritize FortiMail for its pattern-based anomaly detection, which catches business email compromise and account takeover attempts that signature-only solutions miss. The platform's dual protection via gateway and API, combined with real-time FortiGuard threat intelligence, covers both inbound phishing and outbound data exfiltration, scoring strong on NIST DE.CM continuous monitoring. Skip this if your organization needs deep Slack or third-party collaboration app coverage; FortiMail's strength is email-specific, not broader communication channels.
Open-source detection rules for email attacks like BEC, phishing, and malware
AI-powered email security platform protecting against phishing, BEC, and ATO
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Common questions about comparing Sublime Security Sublime Rules vs Fortinet FortiMail Email Security for your email security platforms needs.
Sublime Security Sublime Rules: Open-source detection rules for email attacks like BEC, phishing, and malware. built by Sublime Security. headquartered in United States. Core capabilities include Detection rules for email attacks, Business email compromise (BEC) detection, Credential phishing detection..
Fortinet FortiMail Email Security: AI-powered email security platform protecting against phishing, BEC, and ATO. built by Fortinet. headquartered in United States. Core capabilities include AI-powered threat detection using ML and LLM, Multi-layered email scanning with heuristics and optical recognition, Inbound and outbound email protection..
Both serve the Email Security Platforms market but differ in approach, feature depth, and target audience.
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