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Security report for mjt.lu

Mailjet · Technology · N/a

Medium risk. 7 critical or high findings in GDPR outside view, Security headers and 1 other check.

Security score

68/100

Risk levelMedium

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

Mailjet operates as a cloud-based email delivery platform specializing in transactional and marketing emails, serving thousands of customers globally. The analyzed subdomain mjt.lu is used primarily for link redirection and static content hosting, reflecting a technical support role within the broader Mailjet infrastructure. The website content is minimal but clearly communicates the purpose and provides essential contact information for abuse reporting. The business is positioned as a reputable player in the email delivery market with strict anti-spam policies and transparent legal documentation. From a technical perspective, the site uses basic HTML and CSS with no detected advanced frameworks or CMS. The performance and mobile optimization are moderate to basic, with no evident analytics or tracking scripts, indicating a focus on minimalism and privacy. Security posture is adequate with HTTPS usage and abuse contact channels, but lacks advanced security headers and cookie consent mechanisms, which could be improved. Overall, the security posture is moderate with strengths in abuse handling and policy transparency but opportunities exist to enhance security headers and privacy compliance. The domain WHOIS data aligns well with the business branding and shows no suspicious patterns, supporting legitimacy. The site is safe for general audiences with no adult or questionable content detected. Strategic recommendations include implementing security headers, adding cookie consent if applicable, improving mobile and accessibility features, and publishing a vulnerability disclosure policy to strengthen trust and compliance.

Scanned

NIS2 and GDPR posture

GDPR outside view
28/ 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

7 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.

    • Critical

      EU business without adequate privacy measures

      EU businesses are subject to strict GDPR requirements

      What to do: Implement comprehensive GDPR compliance including privacy policy, cookie consent, and data protection measures

    • 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

  2. Security headers

    Security headers are instructions your web server sends to every visitor’s browser. Missing ones leave visitors more exposed to attacks such as clickjacking and injected scripts.

    • High

      Missing Strict-Transport-Security header

      Forces HTTPS connections

      What to do: Add "Strict-Transport-Security: max-age=31536000; includeSubDomains; preload"

      • CWE-319
      • OWASP A04:2025
      • ASVS V3.4.1
    • High

      Missing X-Frame-Options header

      Prevents clickjacking attacks

      What to do: Add "X-Frame-Options: DENY" or "X-Frame-Options: SAMEORIGIN"

    • High

      Missing Content-Security-Policy header

      Controls resources the browser is allowed to load

      What to do: Implement a Content-Security-Policy appropriate for your application

      • ASVS V3.4.3
      • OWASP Secure Headers: OWASP Secure Headers Project recommends Content-Security-Policy: default-src 'self'; form-action 'self'; base-uri 'self'; object-src 'none';…

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Keep watching mjt.lu

This scan found 20 issues across 5 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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  • 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
77
Security headers
15
Email security
100
DNS health
85
Network security
100
GDPR outside view
28
Average
68

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

Mailjet is positioned as an important entity in the technology sector, providing cloud email services focused on transactional and marketing communications. Its business model revolves around SaaS offerings for email delivery, targeting businesses requiring reliable and scalable email infrastructure. The company benefits from a large customer base and a strong reputation for anti-spam enforcement. Revenue streams likely include subscription plans and usage-based billing. The absence of detailed company registration or founding year limits deeper business intelligence, but the consistent WHOIS data and domain usage indicate operational maturity. The partnership ecosystem is not explicitly detailed, and no subsidiaries or parent companies are identified. The website's minimal content suggests a technical support role rather than a primary marketing site.

Security posture

The security maturity level is moderate. The site enforces strict anti-spam policies and provides clear abuse reporting channels, which are critical for operational security. However, the lack of security headers such as Content Security Policy, HSTS, and X-Frame-Options reduces defense-in-depth. No vulnerabilities or exposed sensitive data were detected in the provided content. GDPR compliance is supported by a comprehensive privacy policy, but cookie consent mechanisms are absent. Incident response readiness is indicated by the abuse contact email. Overall, the security culture appears proactive regarding abuse but could benefit from enhanced technical controls and transparency through vulnerability disclosure.

Recommendations

  1. Implement standard security headers (CSP, HSTS, X-Frame-Options) to improve protection against common web attacks.
  2. Add a cookie policy and consent mechanism if cookies or tracking technologies are used on the site.
  3. Enhance mobile optimization and accessibility to improve user experience and compliance.
  4. Publish a vulnerability disclosure or security.txt file to encourage responsible reporting and transparency.
  5. Regularly review and update security policies and technical configurations to maintain compliance and trust.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Mailjet
Description
Mailjet is a real-time Cloud Emailing platform used by thousands of customers for transactional messages and newsletters.
Key services
Transactional email delivery, Newsletter and marketing email services, Link redirection and static content hosting
Content quality
basic
Branding
consistent

Technology

Stack
HTML5, CSS reset stylesheet
Performance
moderate
Mobile
basic
Accessibility
basic
SEO
poor

Security

Observed score
60/100
Good practices seen
  • Strict anti-spam policy
  • Abuse reporting mechanism

Analytics and tracking

Tracking level
minimal
Privacy practices
good

Advertising

Transparency
poor

Site quality

Design
basic
User experience
basic
Content relevance
basic
Navigation
basic
Professionalism
basic
Trustworthiness
moderate

Key observations

  1. Website is a technical subdomain used for link redirection and static content hosting.
  2. Content is minimal and informational, with no forms or user input fields.
  3. No social media links or phone numbers found.
  4. Contact email for abuse reporting is provided.
  5. No cookie consent mechanism detected despite presence of external CSS.
  6. No security headers or advanced security configurations detected in provided data.
  7. No analytics or tracking scripts detected.
  8. Website uses HTTPS (implied by external CSS link using https).
Technical notes

Notes

The website uses basic HTML5 and a CSS reset stylesheet loaded from an external source. No JavaScript libraries, frameworks, or CMS platforms were detected. The site is minimalistic, serving primarily as a technical subdomain for link redirection and static content hosting. Performance is likely moderate given the minimal content and external CSS usage. Mobile optimization and accessibility are basic, with no advanced features or ARIA roles observed. SEO optimization is poor due to minimal meta tags and no Open Graph or structured data present. Hosting provider details are not available from the provided data. The technical debt appears low due to simplicity but modernization opportunities exist to improve security and user experience.
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

Earlier scans of this domain

  1. 67/100Medium29 findingsView report
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