Features, pricing, ratings, and pros & cons — compared head-to-head.
Kiteworks Secure Email is a commercial email encryption tool by Kiteworks. Retarus Enterprise Cloud Fax is a commercial email encryption tool by Retarus. Compare features, ratings, integrations, and community reviews side by side to find the best email encryption fit for your security stack.
Based on our analysis of NIST CSF 2.0 coverage, core features, integrations, company size fit, here is our conclusion:
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.
Enterprise and mid-market security teams handling regulated document workflows (healthcare, financial services, legal) should use Retarus Enterprise Cloud Fax because it eliminates the compliance burden of managing on-premises fax infrastructure while maintaining audit trails for HIPAA, FERPA, and GDPR requirements. HITRUST e1 certification plus six geographically distributed data centers with redundancy means you're not gambling on a single vendor's infrastructure resilience, and the SAP and EHR integrations handle legacy systems without requiring expensive rewrites. Skip this if your organization needs modern API-first workflows as the primary interface; Retarus excels at retrofitting secure fax into existing enterprise stacks, not rearchitecting them.
Secure email platform with encryption, DLP, and policy automation
Cloud-based enterprise fax service for secure document transmission
Access NIST CSF 2.0 data from thousands of security products via MCP to assess your stack coverage.
Access via MCPNo reviews yet
No reviews yet
Explore more tools in this category or create a security stack with your selections.
Common questions about comparing Kiteworks Secure Email vs Retarus Enterprise Cloud Fax for your email encryption needs.
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.
Get strategic cybersecurity insights in your inbox