Beyond Encryption Mailock for M365 vs PreVeil Email: 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)..

PreVeil Email: E2E encrypted email for regulated industries handling CUI and ITAR data. built by PreVeil. Core capabilities include End-to-end encrypted email with zero-knowledge architecture (PreVeil cannot access user data), Works with existing email addresses without infrastructure changes, Encrypted inbox added to existing email clients (Outlook, Gmail, Apple Mail)..

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). PreVeil Email differentiates with End-to-end encrypted email with zero-knowledge architecture (PreVeil cannot access user data), Works with existing email addresses without infrastructure changes, Encrypted inbox added to existing email clients (Outlook, Gmail, Apple Mail).

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

Beyond Encryption Mailock for M365 integrates with Microsoft 365, Microsoft Outlook, Exchange Online, Unipass ID, CRM (generic). PreVeil Email integrates with Microsoft Outlook, Gmail, Apple Mail, Microsoft Office 365. Check integration compatibility with your existing security stack before deciding.

Beyond Encryption Mailock for M365 and PreVeil Email 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.