KnowBe4 Cloud Email Security is a commercial email security platforms solution by KnowBe4. Mimecast Advanced Email Security is a commercial email security platforms solution by Mimecast. Features, integrations, deployment and the company behind each one, side by side.
What our shortlists say about the one we picked.
Best for: Companies wanting a full gateway with clear tracking
It earns its place because you can run it as a gateway or through an API, and archiving and continuity sit in the same platform, which suits a company with a mixed mail setup. Social graphing and computer vision aim at impersonation, not only malware. Weigh whether you need the archive and continuity parts, since they change how much of your mail flow depends on one vendor.
From Best Email Security Solutions for Business, Fall 2026
Reviewed by Nika (Nikoloz) Kokhreidze.
AI-driven email security platform for Microsoft 365 inbound/outbound threats
Email security platform protecting M365 & Google Workspace from threats
See more solutions in this category, or build a security stack from your picks.
Based on what each listing shows: deployment, company size, price and open source.
KnowBe4 Cloud Email Security fits if you want a cloud product.
Mimecast Advanced Email Security fits if you need both cloud and on-premises options.
Common questions when comparing KnowBe4 Cloud Email Security vs Mimecast Advanced Email Security for email security platforms.
KnowBe4 Cloud Email Security: AI-driven email security platform for Microsoft 365 inbound/outbound threats, built by KnowBe4.
Mimecast Advanced Email Security: Email security platform protecting M365 & Google Workspace from threats, built by Mimecast.
The table above shows where their features, integrations, deployment and company size fit differ.
KnowBe4 Cloud Email Security is made by KnowBe4. Mimecast Advanced Email Security is made by Mimecast. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.
Often, yes. KnowBe4 Cloud Email Security and Mimecast Advanced Email Security are both Email Security Platforms products, and both cover Microsoft 365. 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