Email security vendors in the United States

PreVeil provides end-to-end encrypted email and file sharing for defence and regulated industries.

Abnormal AI uses behavioural analysis to detect and stop email, identity, and AI-driven cyber attacks.

Barracuda Networks provides cybersecurity solutions for email, networks, applications, and data.

Cofense provides phishing detection and response services using AI and human validation.

Provides AI-driven email security to stop phishing, business email compromise, and deepfake attacks.

LuxSci provides secure email, marketing and forms for healthcare organisations.

Provides email security products for managed service providers, including filtering, encryption and DMARC tools.

MailRoute is a cloud email security provider.

Paubox provides HIPAA compliant email and security services for healthcare organisations.

StrongestLayer provides AI email security for Microsoft 365 and Google Workspace.

Virtru provides encryption and access control for email, files, and SaaS applications.

AegisAI provides agentic email security for Microsoft 365 and Google Workspace.

Proofpoint provides cybersecurity solutions to protect people, data, and AI across email, cloud, and collaboration tools.

Microsoft sells software, cloud services, hardware, and gaming products.

Fortinet provides cybersecurity solutions and services, including networking and security convergence, for enterprises and governments.

Cloudflare provides a global network for security, performance, and full-stack development.

Kiteworks provides a platform for secure data exchange and governance across email, file sharing, and APIs.

Centeye provides a security platform for managed service providers and managed security service providers.

dmarcian provides DMARC email authentication services and tools to protect domains from phishing and abuse.

Expel provides managed detection and response security services using AI and human analysts.

Forcepoint provides data security software that controls how AI applications and agents access sensitive information.

KnowBe4 provides a platform for security awareness training and AI agent security to reduce human risk.

Netarx provides real-time deepfake detection across video, voice, email and messaging for businesses.

NINJIO provides cybersecurity awareness training and human risk management through personalised coaching and phishing simulations.

PowerDMARC provides a cloud-based platform for email authentication and domain security.

Sendmarc provides a platform for managing DMARC, SPF, and DKIM email authentication.

Valimail provides automated DMARC and email authentication services to stop phishing and domain impersonation.

Z-JAK Technologies is a Louisville-based provider of managed IT and cybersecurity services for small and midsize businesses, typically with 5 to 150 employees.

Provides a platform for managing email authentication, DNS and threat intelligence to protect domains from spoofing.