Beyond Encryption Mailock for Outlook vs Kiteworks Secure Email: Side-by-Side Comparison (2026)

Beyond Encryption Mailock for Outlook

SMB and mid-market teams that need to stop encrypted emails from being forwarded or screenshotted after delivery should use Beyond Encryption Mailock for Outlook, since message revocation works even after recipients have opened attachments. The tool covers NIST PR.DS and PR.AA through AES-256 encryption and multi-factor recipient authentication, eliminating the "trust the recipient" problem that plagues standard TLS. Skip this if your org requires integration with Gmail or non-Microsoft clients; Mailock is Outlook-only and leaves users on other platforms without encryption protections.

Kiteworks Secure Email

Mid-market and enterprise teams handling regulated data through email will find Kiteworks Secure Email worth the deployment effort because its policy automation engine actually enforces DLP rules at send-time rather than just logging violations afterward. FIPS 140-2 validated encryption across S/MIME, OpenPGP, and TLS 1.3 plus sandboxing and content disarm coverage address the PR.DS and PR.PS controls that compliance auditors actually ask about. Skip this if your organization needs a lightweight, user-friction-free solution; Kiteworks requires integration work and will surface policy violations that force conversations with business teams about what email traffic is actually allowed.