# KnowBe4 Cloud Email Security vs Sublime Security Sublime Rules: side-by-side comparison (2026) [KnowBe4 Cloud Email Security](https://cybersectools.com/tools/knowbe4-cloud-email-security) is a commercial [email security platforms](https://cybersectools.com/categories/email-security-platforms) solution by [KnowBe4](https://cybersectools.com/companies/knowbe4). [Sublime Security Sublime Rules](https://cybersectools.com/tools/sublime-security-sublime-rules) is a free [detection engineering](https://cybersectools.com/categories/detection-engineering) solution by [Sublime Security](https://cybersectools.com/companies/sublime-security). Features, integrations, deployment and the company behind each one, side by side. Need the answer fast? [Best Email Security Solutions for Business](https://cybersectools.com/shortlists/best-email-security-platforms) picks Proofpoint Core Email Protection, Microsoft Defender for Office 365, Mimecast Advanced Email Security and 4 more. ## Side-by-side comparison | | KnowBe4 Cloud Email Security | Sublime Security Sublime Rules | |---|---|---| | Pricing model | Commercial | Free | | Category | Email Security Platforms | Detection Engineering | | Verified | No | No | | Deployment type | Cloud | On-Premises | | Company size fit | SMB, Mid-Market, Enterprise | Startup, SMB, Mid-Market, Enterprise | | Company | KnowBe4 | Sublime Security | | Headquarters | – | – | ### Use cases and capabilities | | KnowBe4 Cloud Email Security | Sublime Security Sublime Rules | |---|---|---| | Microsoft 365 | Yes | – | | Ransomware Prevention | Yes | – | | Detection Rules | – | Yes | | Open Source | – | Yes | | YARA | – | Yes | ### Core features **KnowBe4 Cloud Email Security** 10 features listed. Sign in on the page to see them. **Sublime Security Sublime Rules** 10 features listed. Sign in on the page to see them. ### Integrations **KnowBe4 Cloud Email Security** 5 integrations listed. Sign in on the page to see them. **Sublime Security Sublime Rules** No integrations listed. ## Which one fits you Based on what each listing shows: deployment, company size, price and open source. - [KnowBe4 Cloud Email Security](https://cybersectools.com/tools/knowbe4-cloud-email-security) fits if you want a cloud product. - [Sublime Security Sublime Rules](https://cybersectools.com/tools/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. ## KnowBe4 Cloud Email Security vs Sublime Security Sublime Rules FAQ Common questions when comparing KnowBe4 Cloud Email Security vs Sublime Security Sublime Rules for email security platforms. ### What is the difference between KnowBe4 Cloud Email Security and Sublime Security Sublime Rules? **KnowBe4 Cloud Email Security**: AI-driven email security platform for Microsoft 365 inbound/outbound threats, built by KnowBe4. **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. ### Who makes KnowBe4 Cloud Email Security and Sublime Security Sublime Rules? **KnowBe4 Cloud Email Security** is made by KnowBe4. **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. ### Is KnowBe4 Cloud Email Security a good alternative to Sublime Security Sublime Rules? In part. KnowBe4 Cloud Email Security and Sublime Security Sublime Rules are not in the same category on CybersecTools. Key differences: KnowBe4 Cloud 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. ## Related comparisons - [KnowBe4 Cloud Email Security vs ConnectWise Email Security](https://cybersectools.com/compare/connectwise-email-security-vs-knowbe4-cloud-email-security) - [KnowBe4 Cloud Email Security vs Cellopoint Cloud Email Security Solution](https://cybersectools.com/compare/cellopoint-cloud-email-security-solution-vs-knowbe4-cloud-email-security) - [KnowBe4 Cloud Email Security vs ESET Cloud Office Security](https://cybersectools.com/compare/eset-cloud-office-security-vs-knowbe4-cloud-email-security) - [Sublime Security Sublime Rules vs ConnectWise Email Security](https://cybersectools.com/compare/connectwise-email-security-vs-sublime-security-sublime-rules) - [Sublime Security Sublime Rules vs Cellopoint Cloud Email Security Solution](https://cybersectools.com/compare/cellopoint-cloud-email-security-solution-vs-sublime-security-sublime-rules) - [Sublime Security Sublime Rules vs ESET Cloud Office Security](https://cybersectools.com/compare/eset-cloud-office-security-vs-sublime-security-sublime-rules) ## Alternatives to each - [See all KnowBe4 Cloud Email Security alternatives](https://cybersectools.com/alternatives/knowbe4-cloud-email-security) - [See all Sublime Security Sublime Rules alternatives](https://cybersectools.com/alternatives/sublime-security-sublime-rules) --- Source: https://cybersectools.com/compare/knowbe4-cloud-email-security-vs-sublime-security-sublime-rules For AI agents: each product above has its own Markdown page (add .md to its URL, for example https://cybersectools.com/tools/knowbe4-cloud-email-security.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md. More on KnowBe4 Cloud Email Security and Sublime Security Sublime Rules: funding, momentum, hiring and news, plus the full product and company record, are available through the Mandos MCP Server (paid plans), which connects to AI assistants: https://mandos.io/mcp?utm_source=cybersectools.com&utm_medium=compare-md