Abnormal Inbound Email Security is a commercial email security platforms solution by Abnormal Security. Sublime Security Sublime Rules is a free detection engineering solution by Sublime Security. Features, integrations, deployment and the company behind each one, side by side.
What our shortlists say about the one we picked.
Best for: Microsoft 365 or Google teams fighting BEC
It belongs here as the API option, because it judges each message against normal behavior and needs no rules to maintain. That suits you if vendor and payment fraud worry you more than mass malware. Since it does not sit in the mail path, decide whether you pair it with a gateway or with the filtering your mail platform already has.
From Best Email Security Solutions for Business, Fall 2026
Reviewed by Nika (Nikoloz) Kokhreidze.
AI-powered email security platform detecting advanced threats via behavioral analysis
Open-source detection rules for email attacks like BEC, phishing, and malware
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Based on what each listing shows: deployment, company size, price and open source.
Abnormal Inbound Email Security fits if you want a cloud product.
Sublime Security Sublime Rules fits if you need to run it on your own servers, you are a startup, you need a free product and you want an open-source product.
Common questions when comparing Abnormal Inbound Email Security vs Sublime Security Sublime Rules for email security platforms.
Abnormal Inbound Email Security: AI-powered email security platform detecting advanced threats via behavioral analysis. Built by Abnormal Security.
Sublime Security Sublime Rules: Open-source detection rules for email attacks like BEC, phishing, and malware. Built by Sublime Security.
The table above shows where their features, integrations, deployment and company size fit differ.
Abnormal Inbound Email Security is made by Abnormal Security. Sublime Security Sublime Rules is open-source. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.
In part. Abnormal Inbound Email Security and Sublime Security Sublime Rules are not in the same category on CybersecTools. Key differences: Abnormal Inbound Email Security is Commercial while Sublime Security Sublime Rules is Free. Use the table above to see where features, deployment and company size fit differ.
Need the answer fast? Best Email Security Solutions for Business picks Proofpoint Core Email Protection, Microsoft Defender for Office 365, Mimecast Advanced Email Security and 4 more.See the shortlist
