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Beyond Encryption Mailock for M365 is a commercial email encryption tool by Beyond Encryption. PreVeil is a free email encryption tool by PreVeil. Compare features, ratings, integrations, and community reviews side by side to find the best email encryption fit for your security stack.
CST VerdictBased on our analysis of NIST CSF 2.0 coverage, core features, integrations, company size fit, here is our conclusion:
SMB and mid-market teams standardized on Microsoft 365 should pick Beyond Encryption Mailock for M365 if message revocation is non-negotiable; the ability to recall emails even after a recipient opens them covers the mistake you'll inevitably make sending sensitive data to the wrong person. AES-256 encryption with SMS and Q&A recipient verification handles NIST PR.AA without requiring users to manage separate identity infrastructure. Skip this if your organization needs DLP that catches data before it leaves the network or if you're already enforcing encryption at the gateway level; Mailock layers on top of M365 rather than replacing email security controls.
Small teams and individual contributors who need encrypted email without deployment friction should use PreVeil Express; the browser-based client requires zero IT overhead and the free tier removes budget as an objection. The desktop version supports passwordless login and unlimited file uploads, which matters if you're moving sensitive files regularly. Skip this if your organization needs centralized key management, audit logging, or admin controls; PreVeil prioritizes user privacy over institutional governance, which is the opposite of what compliance-heavy enterprises need.
AES-256 encrypted email add-on for M365 with auth & revocation.
Free E2E encrypted email & file sharing for browser and desktop.
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Common questions about comparing Beyond Encryption Mailock for M365 vs PreVeil for your email encryption needs.
Beyond Encryption Mailock for M365: AES-256 encrypted email add-on for M365 with auth & revocation. built by Beyond Encryption. headquartered in United Kingdom. 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: Free E2E encrypted email & file sharing for browser and desktop. built by PreVeil. headquartered in United States. Core capabilities include End-to-end encrypted email messaging, Encrypted file sharing, Secure cloud drive sync and storage..
Both serve the Email Encryption market but differ in approach, feature depth, and target audience.
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