Email security

Gateways and API-based services that filter phishing, malware, spam and business email compromise.

16 vendors · alphabetical, never ranked

Abnormal AIAbnormal AI sells a behavioral analytics platform that protects email and identity systems and monitors use of AI tools and agents, with separate modules for account takeover detection, identity threat protection and AI agent security.Privately held · primary category
Adaptive SecurityAdaptive Security sells a platform that unifies security awareness training, phishing simulations, agentic email security and AI governance.Privately held
Barracuda NetworksBarracuda Networks sells the BarracudaONE cybersecurity platform, covering email protection, application protection, network security and data protection, along with a managed XDR service.Owned by KKR since 2022 · primary category
BroadcomBroadcom sells Symantec Enterprise Cloud, a security portfolio covering endpoint, network, information and email security, including endpoint detection, response and management products.Public (NASDAQ: AVGO)
Check Point Software TechnologiesCheck Point Software Technologies sells network firewalls, a secure access service edge product, email security, and extended detection and response, among other cyber security products.Public (NASDAQ: CHKP)
CofenseCofense sells a phishing defense platform that combines AI based detection with threat data reported by employees, along with a security awareness training product that runs phishing simulations.Ownership not established · primary category
DarktraceDarktrace sells a family of AI-based security products, sold under names such as Darktrace / NETWORK, / EMAIL, / CLOUD, / OT, / ENDPOINT and / IDENTITY, that learn what is normal for a customer's own environment and flag anomalous activity for investigation and response.Owned by Thoma Bravo since 2024
EgressEgress sold a cloud email security platform that assesses human risk and adapts policy controls to defend against phishing and outbound data loss.Owned by KnowBe4 since 2024 · primary category
IRONSCALESIRONSCALES sells an email security platform that combines machine learning threat detection with employee-reported phishing data, including an AI-driven incident response component branded Themis.Privately held · primary category
KnowBe4KnowBe4 sells security awareness training and simulated phishing software, alongside email and collaboration security products and a set of AI agents branded AIDA for automating human risk management tasks.Owned by Vista Equity Partners since 2023
MimecastMimecast sells email security, security awareness training, data loss and insider risk protection, email authentication and collaboration security products, along with an email archiving service for compliance.Owned by Permira since 2022 · primary category
ProofpointProofpoint sells email security, data loss prevention, insider threat management and human risk management software, along with a collaboration security product that extends detection beyond email.Owned by Thoma Bravo since 2021 · primary category
Sublime SecuritySublime Security sells an email security platform built around AI agents that triage reported and suspicious emails and design new detections, along with an email data loss prevention module.Privately held · primary category
Trend MicroTrend Micro sells TrendAI Vision One, an enterprise cybersecurity platform covering cloud, endpoint, email, identity and network security, alongside a separate consumer security line.Public (TSE: 4704)
TrustifiTrustifi sells an email security platform covering inbound threat detection, outbound data loss prevention, account takeover protection and email archiving, with a separate module extending scanning to Microsoft Teams, OneDrive and SharePoint.Privately held · primary category
VirtruVirtru sells a data-centric encryption platform that protects email, files and data flowing through SaaS applications, letting customers hold their own encryption keys.Privately held

No vendor pays to be listed or to change what we write. Descriptions are ours, drawn from each company's own site and filings. Corrections: /corrections.