Best SEPPmail Secure Email Gateway Alternatives & Competitors in 2026

Z1 SecureMail Gateway

Enterprise email encryption gateway supporting S/MIME, PGP, and digital signing.

LuxSci

HIPAA-compliant email, marketing, and forms platform for healthcare orgs.

TitanHQ EncryptTitan

Email encryption solution for secure information exchange via email

Zivver Secure Email Gateway

Secure email gateway with automated DLP and zero-knowledge encryption

RPost RMail Email Encryption

Email encryption service with automated delivery and compliance tracking

CloudMask E2EE for Healthcare

E2E encryption for healthcare emails, files & apps protecting ePHI/PII.

DigiCert Secure Email (S/MIME) Certs

S/MIME certificates for end-to-end email encryption and signing.

Kiteworks Secure Email

Secure email platform with encryption, DLP, and policy automation

Nightfall Data Encryption

AI-powered email encryption solution for compliance with HIPAA, FINRA, FERPA

Egress Protect

End-to-end email encryption with DLP and access controls for Microsoft 365

INKY Email Encryption

Email encryption solution for securing sensitive data in email communications

Galaxkey Email Encryption Software

Email encryption software using FIPS 140-2 compliant modules and RSA keys

Virtru Email Encryption

End-to-end email encryption for Gmail and Outlook with access controls

Virtru Data Protection Gateway

Automated email & SaaS encryption gateway with DLP rules & access controls

Seclore Email Encryption

Email encryption solution with access control, tracking, and revocation

OpenText Core Email Encryption

Cloud-based email encryption with automated DLP policies and delivery methods

Smartlockr Secure Email for Recruiters

Secure email solution for recruiters to encrypt and share sensitive candidate data

Paubox Email Encryption

HIPAA-compliant email encryption for Google Workspace and Microsoft 365

SecurelyShare for Email

End-to-end email encryption solution with centralized policy management

Beyond Encryption Mailock® Secure Email

Encrypted email platform with recipient verification, tracking, and revocation.

Beyond Encryption Mailock for Outlook

Outlook add-in for end-to-end email encryption with recipient auth & revoke.

Beyond Encryption Mailock Enterprise

Enterprise secure email gateway with AES-256 encryption & recipient auth.

Beyond Encryption Mailock for M365

AES-256 encrypted email add-on for M365 with auth & revocation.

Beyond Encryption Mailock Automated

Automated bulk secure email encryption & delivery for enterprise orgs.

CloudMask End-to-End Encryption

E2EE solution for emails, files & SaaS apps with user-held encryption keys.

CloudMask Secure Gmail

End-to-end Gmail encryption with user-controlled keys and trusted contacts.

CloudMask E2EE for Education

E2EE solution for education covering emails, files, and apps.

Echoworx Branding as a Service

White-label branding layer for Echoworx's email encryption platform.

Intermedia Email Encryption

Cloud-based email encryption service using PKI, S/MIME & X.509 for orgs.

PreVeil Security

End-to-end encrypted email & file sharing with zero-trust architecture.

PreVeil Admin Features

Enterprise admin module for encrypted email & file sharing with E-discovery controls.

PreVeil Email

E2E encrypted email for regulated industries handling CUI and ITAR data.

SalaX Secure Mail

Email encryption solution for secure organizational communications.

StealthMail

Enterprise email security via encrypted stealth-links, bypassing SMTP vulnerabilities.

Honeycake Email

Email client plugin that encrypts file attachments into .cake format before sending.

PRIM'X ZEDMAIL

Transparent email and attachment encryption for corporate messaging via Outlook

Beyond Encryption Mailock Free

Free encrypted email tool with Q&A recipient auth for individuals.

PreVeil

Free E2E encrypted email & file sharing for browser and desktop.

Virtru Gmail Encryption

End-to-end email encryption for Gmail with granular access controls

Virtru Google Workspace Encryption and Data Privacy

Encryption and data privacy solution for Google Workspace applications