Cisco Secure Email Threat Defense is a commercial email security platforms solution by Cisco. Sublime Platform is a free detection engineering solution. Features, integrations, deployment and the company behind each one, side by side.
What our shortlists say about the one we picked.
Best for: Cisco shops wanting Talos-backed filtering
It is on the list as a Microsoft 365 product that can grow with you: you start in API mode and add the inline gateway later, from the same console. That suits a team that already runs Cisco security. Check fit first if you run Google Workspace or your own mail servers, because the product is built for Microsoft 365.
From Best Email Security Solutions for Business, Fall 2026
Reviewed by Nika (Nikoloz) Kokhreidze.
Email threat protection for Microsoft 365 with advanced detection capabilities
A free and open platform for detecting and preventing email attacks like BEC, malware, and credential phishing, utilizing Message Query Language (MQL) for behavior description.
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Based on what each listing shows: deployment, company size, price and open source.
Cisco Secure Email Threat Defense fits if you want a cloud product.
Sublime Platform fits if you need both cloud and on-premises options, you are a startup, you need a free product and you want an open-source product.
Common questions when comparing Cisco Secure Email Threat Defense vs Sublime Platform for email security platforms.
Cisco Secure Email Threat Defense: Email threat protection for Microsoft 365 with advanced detection capabilities. Built by Cisco.
Sublime Platform: A free and open platform for detecting and preventing email attacks like BEC, malware, and credential phishing, utilizing Message Query Language (MQL) for behavior description.
The table above shows where their features, integrations, deployment and company size fit differ.
Cisco Secure Email Threat Defense is made by Cisco. Sublime Platform is open-source with 250 GitHub stars. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.
In part. Cisco Secure Email Threat Defense and Sublime Platform are not in the same category on CybersecTools. Key differences: Cisco Secure Email Threat Defense is Commercial while Sublime Platform is Free, Sublime Platform is open-source. 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
