Email Encryption software

Email Encryption vendors to know

Established leaders, challengers, newer entrants and the tools practitioners recommend to each other. Being listed is not a ranking or an endorsement, and no vendor paid to appear.

• Virtru

  Established leader

  Rated for strong usability with granular access controls, revocation, expiration and audit logs; partnered with Mattermost on Zero Trust Data Protection in July 2026.

  Official site

• Proofpoint Email Encryption

  Established leader

  Enterprise-grade encryption bundled with Proofpoint's threat protection and DLP, aimed at regulated organizations worried about data exfiltration.

  Official site

• OpenText Zix Email Encryption

  OpenText (Zix)

  Established leader

  One of the longest-established email encryption platforms with a large install base across healthcare, finance and government; now part of OpenText.

  Official site

• Microsoft Purview Message Encryption

  Established leader

  Azure Rights Management-based encryption bundled into Microsoft 365 Business Premium and E3/E5, controlling access to encrypted mail via a secure web portal.

  Official site

• Echoworx

  Challenger

  Cloud-based encryption platform offering eight delivery methods including a secure portal; recently added a Google Workspace add-on and an EU trust-services partnership with SwissSign.

  Official site

• Mimecast Secure Messaging

  Challenger

  Encrypted messaging bundled into Mimecast's wider email security suite for organizations wanting centralized policy enforcement.

  Official site

• Cisco Secure Email Encryption Service

  Challenger

  Registered-envelope style encryption service used to add push or pull encrypted delivery on top of existing email gateways.

  Official site

• PreVeil

  Emerging

  FIPS 140-2 validated end-to-end encrypted email built for DFARS, CMMC and ITAR compliance; used by defense contractors to protect CUI and FCI.

  Official site

• Proton Mail for Business

  Community favourite

  End-to-end encrypted email built on OpenPGP with custom domain support; positioned as stronger for business features than rival Tuta.

  Official site

• Tuta for Business

  Community favourite

  Open-source, privacy-first encrypted email provider; lacks PGP support for external recipients by default but adds password-protected message encryption.

  Official site