Beyond Encryption Mailock for M365 vs StealthMail: Side-by-Side Comparison (2026)

Beyond Encryption Mailock for M365: AES-256 encrypted email add-on for M365 with auth & revocation. built by Beyond Encryption. Core capabilities include AES-256 end-to-end email encryption, Recipient identity verification via SMS, Q&A, or Unipass ID, Message revocation after send (including post-open)..

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..

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

Beyond Encryption Mailock for M365 differentiates with AES-256 end-to-end email encryption, Recipient identity verification via SMS, Q&A, or Unipass ID, Message revocation after send (including post-open). 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.

Beyond Encryption Mailock for M365 is developed by Beyond Encryption. StealthMail is developed by StealthMail. Vendor maturity, funding stage, and team size can be important factors when evaluating long-term viability and support quality.

Beyond Encryption Mailock for M365 and StealthMail 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.