StealthMail vs Z1 SecureMail Gateway: Side-by-Side Comparison (2026)

StealthMail: Enterprise email security via encrypted stealth-links, bypassing SMTP vulnerabilities. built by StealthMail. Core capabilities include End-to-end email encryption using Stealth-Links instead of direct content transmission, User-owned encryption key management (ECC 512+ bit), Role-based access controls for managing user permissions..

Z1 SecureMail Gateway: Enterprise email encryption gateway supporting S/MIME, PGP, and digital signing. built by Zertificon Solutions GmbH. Core capabilities include S/MIME and PGP email encryption at the gateway level, Digital email signing for authenticity and integrity, Automated certificate management via CertMagic®..

Both serve the Email Encryption market but differ in approach, feature depth, and target audience.

StealthMail differentiates with End-to-end email encryption using Stealth-Links instead of direct content transmission, User-owned encryption key management (ECC 512+ bit), Role-based access controls for managing user permissions. Z1 SecureMail Gateway differentiates with S/MIME and PGP email encryption at the gateway level, Digital email signing for authenticity and integrity, Automated certificate management via CertMagic®.

StealthMail is developed by StealthMail. Z1 SecureMail Gateway is developed by Zertificon Solutions GmbH. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

StealthMail and Z1 SecureMail Gateway serve similar Email Encryption use cases: both are Email Encryption tools, both cover Encryption. Review the feature comparison above to determine which fits your requirements.