Beyond Encryption Mailock for Outlook vs RPost RMail Email Encryption: Side-by-Side Comparison (2026)

Short answer

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. Mid-market and enterprise compliance teams wrestling with email encryption that actually stays encrypted end-to-end should evaluate RPost RMail; its automatic per-recipient detection and AES 256-bit PDF delivery eliminate the friction that kills adoption on traditional PGP-based systems. HIPAA and GDPR compliance tracking is built in with registered receipt audit records, removing the manual logging burden. Skip this if your organization needs DLP or advanced threat detection layered into the email gateway; RMail encrypts what you send but doesn't inspect what's arriving for data exfiltration patterns.