Beyond Encryption Mailock for M365 vs Retarus Enterprise Cloud Fax: 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)..

Retarus Enterprise Cloud Fax: Cloud-based enterprise fax service for secure document transmission. built by Retarus. Core capabilities include Email-to-fax transmission, API integration for fax operations, HITRUST e1 certified backend infrastructure..

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). Retarus Enterprise Cloud Fax differentiates with Email-to-fax transmission, API integration for fax operations, HITRUST e1 certified backend infrastructure.

Beyond Encryption Mailock for M365 is developed by Beyond Encryption. Retarus Enterprise Cloud Fax is developed by Retarus. 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). Retarus Enterprise Cloud Fax integrates with SAP, Microsoft Outlook/Exchange, LDAP, EHR systems. Check integration compatibility with your existing security stack before deciding.

Beyond Encryption Mailock for M365 and Retarus Enterprise Cloud Fax 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.