SPF and DMARC: what your domain scan actually tells you
Understand SPF, DMARC and limited DKIM discovery, distinguish a missing policy from a failed lookup, and plan a safe email-security change.
Read the guideXRENN Labs s.r.o.
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Understand the evidence. Choose the next step.
Practical explanations of what our domain scanner measures, what its results cannot prove and how to verify a change.
TLS and certificates: a valid connection is only the starting point
Read certificate validity and negotiated TLS correctly. Understand the limits of one external handshake and how to verify a certificate renewal.
Read the guideMissing security headers: improve protection without breaking the website
What CSP and Permissions-Policy findings mean, which response the scanner checks, and how to deploy headers while preserving forms and sign-in.
Read the guideMicrosoft 365 discovery: what public tenant evidence can establish
Interpret tenant discovery, Autodiscover and public DNS without confusing a missing Microsoft 365 service with a failed check or an internal security audit.
Read the guideCybersecurity, NIS2 & AI with Guarantor.
Direct contact with the expert guarantor for ISO 27001 ISMS, new Czech Cyber Security Act (ZKB 264/2025 Sb.) / NIS2 compliance, penetration testing, and world-class AI security.
Whether you are addressing the requirements of the new Czech Cyber Security Act (ZKB 264/2025 Sb.), the European NIS2 directive, ISO/IEC 27001 certification, or securely deploying frontier AI models and offline EdgeGuardian appliances, send your project inquiry to schedule an expert consultation.
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ISO/IEC 27001:2023
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Information Security Management (ISMS), audit certification, and security policy implementation.
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