8 Mimecast Alternatives for Email Security in 2026
Summary
Aikido compares eight Mimecast alternatives, outlining their email-security capabilities, deployment options and limitations. The guide also explains how to assess archiving, continuity, licensing and migration needs.
Key points
- The guide notes that gateway filters may miss hijacked legitimate accounts and internal email, and says behavioral history can help detect these threats.
- It compares eight alternatives: Noon Security, Proofpoint, Abnormal AI, Microsoft Defender for Office 365, Check Point, IRONSCALES, Barracuda and KnowBe4.
- The article says Noon extends beyond email to employee devices and AI tools, but archive, continuity and outbound-control requirements need separate consideration.
- Abnormal AI is described as using employee and vendor behavioral baselines to flag impersonation and vendor-fraud messages.
- The guide distinguishes Microsoft Defender for Office 365 Plan 2’s administrator-approved remediation from automatic cleanup for certain qualifying malicious-mail clusters.
- Its migration checklist recommends mapping retained services and permissions, testing with representative users, validating threat handling and keeping a rollback route.
Article Details
- Topic
- Comparison of Mimecast alternatives for email security, archiving, and workforce protection
Vendors
Abnormal AIAbnormal AI: Emphasizes employee and vendor behavior.AikidoWhat it does: Noon is Aikido Security’s workforce security platform. Aikido secures the software a company builds; Noon secures the people building it. Email protection detects and removes the phishing and businessBarracudaBarracuda: Barracuda Email Protection Premium Plus address retained communications as well as malicious messages. Historical data still requires its own transition plan.Check PointCheck Point Email SecurityIRONSCALESIRONSCALES: Worth considering when the purchase centers on email operations and adjustable remediation automation.KnowBe4KnowBe4: Suits buyers connecting live email defense with an established learning program, though it stays within email and training; wider needs scope separately.MicrosoftIf you need email security inside existing Microsoft operationsMimecastMimecast is an email security product built around a secure email gateway, with email archiving and business continuity packaged alongside it. That design worked when most threats showed up as malware or spam theProofpointProofpoint: Offers behavioral detection and investigation across API and gateway deployments.
Products
Abnormal AI Inbound Email SecurityWhat it does: Abnormal AI Inbound Email Security builds behavioral baselines for your employees and vendors, then flags messages that deviate from them using identity and content signals. It is aimed at the plausibleBarracuda Email Protection Premium PlusBarracuda: Barracuda Email Protection Premium Plus address retained communications as well as malicious messages. Historical data still requires its own transition plan.Check Point Email SecurityWhat it does: Check Point Email Security connects over the API and runs anywhere from monitoring to inline prevention. Its coverage reaches supported collaboration tools as well as Microsoft 365 and Google Workspace.IRONSCALES Email ProtectWhat it does: IRONSCALES Email Protect pairs inbound threat detection with remediation that administrators can tune, and checks links and attachments as mail arrives. Its business plans connect to Microsoft 365 andKnowBe4 DefendKnowBe4 Defend plus SATMicrosoft Defender for Office 365Microsoft Defender for Office 365: Consider Plan 2 when your team already manages Microsoft security and wants email investigations in that environment. Establish which licenses and retained services are needed beforeMimecastMimecast is an email security product built around a secure email gateway, with email archiving and business continuity packaged alongside it. That design worked when most threats showed up as malware or spam theNoon SecurityNoon Security: The only option here that reaches past the inbox to the devices employees use and the AI tools they connect, with simulations and training in the same platform.Proofpoint ArchiveProofpoint: Compare Proofpoint Core Email Protection with Proofpoint ArchiveProofpoint Core Email ProtectionProofpoint: Compare Proofpoint Core Email Protection with Proofpoint Archive