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Security report for mailbox.org

Heinlein Support GmbH · Technology · Germany

Low risk. 4 critical or high findings in GDPR outside view.

Security score

83/100

Risk levelLow

0–100, higher is better. How it is calculated

mailbox.org is a well-established German secure email provider operated by Heinlein Support GmbH, founded in 1998. The company offers privacy-focused email services, cloud storage, online office tools, and secure video conferencing, targeting private individuals, businesses, and public sector institutions. The website reflects a strong commitment to data protection, leveraging German privacy laws and certifications such as SHiG, SMiG, and BSI IT Security Labels. The business model is subscription-based, with tiered pricing plans and a free 30-day trial, emphasizing ad-free and encrypted communication.

Scanned

NIS2 and GDPR posture

GDPR outside view
35/ 100 · High
Checks completed
7of 7

NIS2 Art. 21(2)

  1. (a) Risk analysis and security policies: Not visible from outside
  2. (b) Incident handling: One indicator
  3. (c) Business continuity, backups and crisis management: Not visible from outside
  4. (d) Supply chain security: Not visible from outside
  5. (e) Secure acquisition, development and maintenance, including vulnerability handling: Partly checked
  6. (f) Assessing the effectiveness of security measures: Not visible from outside
  7. (g) Cyber hygiene and security training: Not visible from outside
  8. (h) Cryptography and encryption: Partly checked
  9. (i) HR security, access control and asset management: One indicator
  10. (j) Multi-factor authentication and secured communications: Not visible from outside

This scan rated NIS2 with an earlier keyword method that is no longer shown; rescan for the per-article view. Risk management, continuity, supply chain, training, MFA, management oversight (Art. 20) and incident reporting (Art. 23) need internal evidence, and Guard cannot tell whether NIS2 applies to this organisation.

GDPR is indicative only, based on publicly visible signals: Articles 7, 12, 13 and 32 of Regulation (EU) 2016/679 and Article 5(3) of the ePrivacy Directive. Not a certification or legal assessment.

Priority findings

4 findings rated critical or high. Fix these first.

  1. GDPR outside view

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • High

      No Privacy Policy found

      GDPR requires a clear and accessible privacy policy

      What to do: Add a comprehensive privacy policy page and link to it prominently

    • High

      No Cookie Policy found

      GDPR requires clear information about cookie usage

      What to do: Add a dedicated cookie policy explaining cookie usage and purposes

    • High

      No Cookie Consent Banner found

      GDPR requires explicit consent for non-essential cookies

      What to do: Implement a cookie consent banner that appears on first visit

    • High

      Third-party services without privacy policy

      Detected services: LinkedIn

      What to do: Document all third-party data sharing in your privacy policy

Need hands-on remediation? Email guard@offseq.com

Keep watching mailbox.org

This scan found 10 issues across 6 checks. Monitoring re-runs those checks daily, emails you when something material changes and records each fix, so you can show progress.

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Recommended

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  • TLS certificates and expiry
  • DNS records
  • SPF, DKIM and DMARC
  • Security headers
  • GDPR and NIS2 posture
  • Exposed services
  • Third-party trackers
  • Security score drift

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Results by check

Each check with its score, findings and the evidence it collected.

How this score is calculated

The security score runs 0–100, higher is better. It is the plain average of the security checks that completed in this scan, each counted equally. A check that could not run is left out: it counts neither as a pass nor as a fail.

Counted in this score

SSL/TLS
100
Security headers
90
Email security
85
DNS health
90
Network security
100
GDPR outside view
35
Average
83

Not counted

  • NIS2 outside view: Re-weights evidence from the TLS, email, DNS, network and hygiene checks, so counting it would count that evidence twice. Shown on its own.
  • OffSeq Observations: An AI reading of the site, useful context but not reproducible evidence. Shown on its own.

Findings that cap the score at 49

Each of these is serious on its own, so while any is present the site cannot rate better than high risk, however good the other checks are.

  • The certificate is not trusted by browsers
  • The website is not served over HTTPS
  • A database, remote desktop, file-sharing or Telnet service is reachable from the internet
  • The page loads a script from a compromised source
  • The domain registration has expired
  • SPF authorises every server to send mail as the domain

Partial scans

When the site blocks Guard or most checks cannot run, the score covers only the checks that ran (usually DNS and email), is capped at 75 and is shown as partial, without a risk level.

Risk levels

  • Critical0–25
  • High26–49
  • Medium50–75
  • Low76–100

Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

The company positions itself as a trusted provider in the secure communication market, leveraging German data protection standards as a competitive advantage. Its offerings cater to diverse customer segments including private users, companies, and public authorities, with features like custom domains and migration services. The presence of certifications and transparency reports enhances credibility. The company operates independently under Heinlein Support GmbH, with no visible subsidiaries or partners disclosed on the site. The business appears medium-sized with a mature market presence.

Security posture

The website and service demonstrate a strong security posture with HTTPS enforcement, clientTransferProhibited domain status, and emphasis on encryption and privacy. Certifications from recognized German security bodies support this stance. However, some improvements are recommended such as enabling DNSSEC, publishing a vulnerability disclosure policy or security.txt, and providing explicit incident response contacts. No critical vulnerabilities or exposed sensitive data were detected in the analysis.

Recommendations

  1. Enable DNSSEC to enhance domain security and prevent DNS spoofing.
  2. Publish a vulnerability disclosure policy or security.txt file to facilitate responsible reporting.
  3. Add explicit incident response contact information (e.g., security@ or abuse@ email addresses).
  4. Implement and advertise security headers such as Content Security Policy (CSP), HSTS, and X-Frame-Options.
  5. Continue to maintain transparency and update certifications and privacy policies regularly.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Heinlein Support GmbH
Description
mailbox.org is a secure and ad-free e-mail provider offering online office, cloud storage, and video conferencing services with 100% green energy and German data protection standards.
Key services
Secure e-mail, Cloud storage, Online office, Video conferencing (OpenTalk), Custom domain support, Moving service
Content quality
excellent
Branding
consistent

Technology

Stack
jQuery, Contao Open Source CMS, Foundation CSS, Colorbox, MediaElement.js, Highlight.js, jQuery UI
Frameworks
Contao CMS
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Strong encryption emphasized
  • Client transfer prohibited domain status
  • German data protection compliance
  • No tracking or advertising

Analytics and tracking

Services
numbers.mailbox.org (likely internal)
Tracking level
minimal
Privacy practices
good

Advertising

Tracking pixels
numbers.mailbox.org
Transparency
excellent

Site quality

Design
excellent
User experience
good
Content relevance
excellent
Navigation
good
Professionalism
excellent
Trustworthiness
high

Key observations

  1. Website is fully accessible with no blocking or WAF challenges.
  2. Strong emphasis on privacy, security, and German data protection compliance.
  3. Clear segmentation for private, business, and public sector customers.
  4. Multiple certifications and trust seals displayed prominently.
  5. No direct contact emails or phone numbers found; contact primarily via web forms and support portals.
  6. No explicit incident response or security contact information visible.
  7. Modern CMS and JavaScript libraries used; performance moderate but acceptable.
  8. No advertising networks detected; tracking limited and privacy-respecting.
  9. Comprehensive content with good SEO and accessibility features.
Technical notes

Notes

The website uses the Contao Open Source CMS with a modern JavaScript stack including jQuery, Foundation CSS, and media libraries. Performance is moderate with good mobile optimization and basic accessibility features. SEO is well implemented with comprehensive meta tags and Open Graph data. Hosting appears to be managed by the parent company in Germany, aligning with the privacy and security focus. No outdated or vulnerable libraries were detected, but continuous monitoring is advised to maintain security.
Standards and sources

Reference chips under each finding point to the standard, regulation or specification the finding relates to. They are taken from the official datasets below and mapped conservatively: a finding with no defensible link shows none. NIS2 and GDPR references mark where a finding is relevant evidence, not a compliance verdict. Implementing Regulation (EU) 2024/2690 binds digital infrastructure and digital service providers; for other entities it is the most detailed public reading of the Article 21 measures. WCAG, EN 301 549, European Accessibility Act and Web Accessibility Directive references name the requirement an automated accessibility rule relates to; they are not a conformance verdict.

Retrieved 2026-10-25

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