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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

67/100

Risk levelMedium

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

Mailjet operates a technical subdomain (mjt.lu) primarily used for link redirection and static content hosting related to its cloud emailing platform. The company provides transactional and marketing email services to a broad customer base. The website content is minimal but clearly communicates Mailjet's strict anti-spam policies and abuse reporting mechanisms, reflecting a focus on maintaining service integrity and compliance. From a technical perspective, the site uses basic HTML and CSS with no detected CMS or advanced frameworks. The performance and mobile optimization are moderate to basic, with limited SEO and accessibility features. Security posture is adequate with HTTPS usage and anti-spam policies, but lacks visible security headers and cookie consent mechanisms. No forms or user data collection points are present on this subdomain. The WHOIS data aligns well with the business, showing consistent name servers and no privacy protection, supporting legitimacy. No WAF or blocking mechanisms interfere with content access. Overall, the site serves a narrow technical purpose within Mailjet's infrastructure, with room for improvement in security headers, privacy notices, and technical enhancements.

Scanned

This is an earlier scan of mjt.lu. View the latest report

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 21 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
72
Security headers
15
Email security
100
DNS health
85
Network security
100
GDPR outside view
28
Average
67

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 technology company specializing in cloud-based email delivery services. Its business model revolves around providing transactional and marketing email solutions to businesses. The mjt.lu subdomain supports this by handling link redirection and static content hosting. The company targets businesses requiring reliable email communication services. Mailjet's market presence is established with a large customer base, supported by clear anti-spam and abuse policies. The lack of detailed business information on this subdomain is consistent with its technical role rather than a marketing or corporate site.

Security posture

The security posture of the mjt.lu subdomain is moderate. The site enforces strict anti-spam policies and provides clear abuse reporting channels, which are positive indicators of security culture. However, the absence of security headers and cookie consent mechanisms represents areas for improvement. No vulnerabilities or exposed sensitive data were detected in the content. The site uses HTTPS, which is mandatory for secure communication. Incident response contact is clearly provided via abuse@mailjet.com. Overall, the security maturity is adequate for the subdomain's limited scope but could be enhanced with additional technical controls and transparency.

Recommendations

  1. Implement standard security headers such as Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security to improve security posture.
  2. Add a cookie policy and consent mechanism to comply with privacy regulations and enhance user trust.
  3. Enhance SEO and accessibility features to improve site usability and discoverability.
  4. Publish a vulnerability disclosure policy or security.txt file to facilitate responsible security reporting.
  5. Provide more comprehensive business and security information on related domains to improve overall transparency and credibility.
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
HTML, CSS
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. The website is a technical subdomain used primarily for link redirection and static content hosting.
  2. Content is minimal and focused on informing about Mailjet's anti-spam policies and abuse reporting.
  3. No forms or user input fields are present on the page.
  4. No social media links or phone numbers are provided.
  5. No security headers detected in the provided data.
  6. No cookie policy or consent mechanism is present.
  7. The site uses HTTPS (implied by external CSS link using https).
  8. The page is not blocked by any WAF or security challenge.
  9. The domain WHOIS data is consistent with the business and shows no privacy protection or suspicious elements.
Technical notes

Notes

The mjt.lu subdomain is built with simple HTML and CSS, referencing an external CSS reset stylesheet. No JavaScript libraries, CMS, or advanced frameworks are detected. The site is hosted with HTTPS enabled, but no additional hosting provider details are available. Performance is moderate given the minimal content. Mobile optimization and accessibility are basic, with no explicit features detected. SEO optimization is poor due to minimal meta tags and no structured data. The technical infrastructure supports the subdomain's role as a link redirection and static content host but lacks modernization and enhancements that could 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. 68/100Medium28 findingsView report
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