# Proofpoint Core Email Protection vs Sublime Security Sublime Rules: side-by-side comparison (2026) [Proofpoint Core Email Protection](https://cybersectools.com/tools/proofpoint-threat-protection) is a commercial [email security platforms](https://cybersectools.com/categories/email-security-platforms) solution by [Proofpoint](https://cybersectools.com/companies/proofpoint). [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. ## Our take What our shortlists say about the one we picked. ### [Proofpoint Core Email Protection](https://cybersectools.com/tools/proofpoint-threat-protection) Best for: Large companies wanting deep email filtering It earns a place because it goes past filtering into DLP, encryption, archiving and fraud defense from one vendor, which suits a large company that wants to run email security as one program. Archiving and supervision for SEC and FINRA rules matter if you work in financial services. Weigh which parts you really need, because the whole platform is a bigger commitment than a filter. From [Best Email Security Solutions for Business](https://cybersectools.com/shortlists/best-email-security-platforms), Fall 2026. Reviewed by [Nika (Nikoloz) Kokhreidze](https://cybersectools.com/about). 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 | | Proofpoint Core Email Protection | 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 | Proofpoint | Sublime Security | | Headquarters | – | – | ### Use cases and capabilities | | Proofpoint Core Email Protection | Sublime Security Sublime Rules | |---|---|---| | DMARC | Yes | – | | Detection Rules | – | Yes | | Open Source | – | Yes | | YARA | – | Yes | ### Core features **Proofpoint Core Email Protection** 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 **Proofpoint Core Email Protection** 9 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. - [Proofpoint Core Email Protection](https://cybersectools.com/tools/proofpoint-threat-protection) 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. ## Proofpoint Core Email Protection vs Sublime Security Sublime Rules FAQ Common questions when comparing Proofpoint Core Email Protection vs Sublime Security Sublime Rules for email security platforms. ### What is the difference between Proofpoint Core Email Protection and Sublime Security Sublime Rules? **Proofpoint Core Email Protection**: Email security platform with AI-based threat detection and DLP capabilities, built by Proofpoint. **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 Proofpoint Core Email Protection and Sublime Security Sublime Rules? **Proofpoint Core Email Protection** is made by Proofpoint. **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 Proofpoint Core Email Protection a good alternative to Sublime Security Sublime Rules? In part. Proofpoint Core Email Protection and Sublime Security Sublime Rules are not in the same category on CybersecTools. Key differences: Proofpoint Core Email Protection 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 - [Proofpoint Core Email Protection vs Sophos Email](https://cybersectools.com/compare/proofpoint-threat-protection-vs-sophos-email) - [Proofpoint Core Email Protection vs Zivver Secure Business Email](https://cybersectools.com/compare/proofpoint-threat-protection-vs-zivver-secure-business-email) - [Proofpoint Core Email Protection vs Vircom Email Security](https://cybersectools.com/compare/proofpoint-threat-protection-vs-vircom-email-security) - [Sublime Security Sublime Rules vs Sophos Email](https://cybersectools.com/compare/sophos-email-vs-sublime-security-sublime-rules) - [Sublime Security Sublime Rules vs Zivver Secure Business Email](https://cybersectools.com/compare/sublime-security-sublime-rules-vs-zivver-secure-business-email) - [Sublime Security Sublime Rules vs Vircom Email Security](https://cybersectools.com/compare/sublime-security-sublime-rules-vs-vircom-email-security) ## Alternatives to each - [See all Proofpoint Core Email Protection alternatives](https://cybersectools.com/alternatives/proofpoint-threat-protection) - [See all Sublime Security Sublime Rules alternatives](https://cybersectools.com/alternatives/sublime-security-sublime-rules) --- Source: https://cybersectools.com/compare/proofpoint-threat-protection-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/proofpoint-threat-protection.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md. More on Proofpoint Core Email Protection 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