Kiteworks Secure Email vs Retarus Enterprise Cloud Fax: Side-by-Side Comparison (2026)

Kiteworks Secure Email: Secure email platform with encryption, DLP, and policy automation. built by Kiteworks. Core capabilities include Multiple encryption methods (S/MIME, OpenPGP, TLS 1.3, AES-256), FIPS 140-2 validated encryption, Email Protection Gateway with automated policy enforcement..

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.

Kiteworks Secure Email differentiates with Multiple encryption methods (S/MIME, OpenPGP, TLS 1.3, AES-256), FIPS 140-2 validated encryption, Email Protection Gateway with automated policy enforcement. Retarus Enterprise Cloud Fax differentiates with Email-to-fax transmission, API integration for fax operations, HITRUST e1 certified backend infrastructure.

Kiteworks Secure Email is developed by Kiteworks. 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.

Kiteworks Secure Email integrates with Microsoft Outlook, Microsoft Office 365, Microsoft OneDrive, Google Drive, Google Docs and 6 more. Retarus Enterprise Cloud Fax integrates with SAP, Microsoft Outlook/Exchange, LDAP, EHR systems. Check integration compatibility with your existing security stack before deciding.

Kiteworks Secure Email 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.