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Security report for sendibt3.com

Sendinblue · Technology · N/a

Medium risk. 6 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

The domain img.mailin.fr is a technical subdomain operated by Sendinblue, a well-established email marketing and transactional email platform. This subdomain is used primarily for hosting images and tracking links embedded in emails sent by Sendinblue customers. The website content is minimal but clearly communicates its purpose and provides relevant contact information for abuse reporting. The presence of a comprehensive privacy policy and anti-spam policy reflects a commitment to compliance and user protection. From a technical perspective, the site uses modern frontend technologies such as Bootstrap 5.1.3 and is mobile-optimized with a clean, professional design. However, there is a lack of explicit security headers and cookie consent mechanisms, which could be improved to enhance security and privacy compliance. The WHOIS data for this subdomain is not available, which is typical for subdomains and does not indicate suspicious activity. Security posture is moderate with HTTPS implied by the URL, but no detailed security headers or vulnerability disclosures are present. The site provides clear abuse contact channels, which is a positive indicator of incident response readiness. Overall, the domain and website appear legitimate and professionally managed, with room for improvement in security best practices and privacy transparency.

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

6 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

    • 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

  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

  3. SSL/TLS

    TLS encrypts the connection and proves the site is really yours. Weak or expiring certificates trigger browser warnings and put traffic at risk.

    • High

      Weak Protocols Supported

      Server supports weak protocols: TLSv1.1

      What to do: Disable TLS 1.0, TLS 1.1, and all SSL versions

      • CWE-327
      • OWASP A04:2025
      • ASVS V12.1.1

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

Keep watching sendibt3.com

This scan found 22 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.

Daily monitoring

Recommended

€25per month

  • 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
52
Security headers
70
Email security
85
DNS health
70
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

Sendinblue operates in the technology sector, providing SaaS solutions for email marketing and transactional email services. The company targets businesses and marketers who require reliable email delivery and tracking capabilities. Their business model is subscription-based, offering scalable email services to a broad customer base. The use of this subdomain for technical email functions indicates a mature infrastructure supporting their core offerings. Sendinblue's market position is strong as a recognized player in the email marketing space, with a focus on compliance and anti-spam measures. The company maintains a professional online presence with clear policies and abuse reporting mechanisms, supporting trust and customer confidence.

Security posture

The security posture of the domain is moderate. The site uses HTTPS, which is mandatory for secure communications. However, no explicit security headers such as Content Security Policy (CSP), HTTP Strict Transport Security (HSTS), or X-Frame-Options were detected, which are recommended to mitigate common web vulnerabilities. The absence of a vulnerability disclosure policy or security.txt file limits transparency regarding security practices. The presence of a clear abuse contact email and anti-spam policy demonstrates some level of incident response preparedness. No vulnerabilities or exposed sensitive data were identified in the provided content. Enhancing security headers and publishing vulnerability disclosure information would strengthen the security posture.

Recommendations

  1. Implement and enforce security headers including CSP, HSTS, and X-Frame-Options to improve protection against common web attacks.
  2. Add a cookie policy and consent mechanism to comply with privacy regulations and enhance user trust.
  3. Publish a vulnerability disclosure policy or security.txt file to increase transparency and encourage responsible reporting.
  4. Regularly audit and update third-party libraries and dependencies to avoid potential vulnerabilities.
  5. Enhance accessibility features and SEO optimization to improve user experience and search engine visibility.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Sendinblue
Description
Sendinblue is an all-in-one platform used to send email newsletters as well as transactional emails. The domain img.mailin.fr is used for tracking links, hosting images, and related email functionalities for Sendinblue customers.
Key services
Email newsletters, Transactional emails, Link tracking, Image hosting for emails
Content quality
good
Branding
consistent

Technology

Stack
Bootstrap 5.1.3, HTML5, CSS3
Frameworks
Bootstrap
Performance
moderate
Mobile
good
Accessibility
basic
SEO
basic

Security

Observed score
70/100
Good practices seen
  • Use of HTTPS (implied by URL scheme)
  • Abuse contact provided

Analytics and tracking

Tracking level
minimal
Privacy practices
good

Advertising

Transparency
poor

Site quality

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

Key observations

  1. Domain is a technical subdomain used by Sendinblue for email tracking and image hosting.
  2. Website content is minimal but informative and professional.
  3. No forms or user input fields detected on the page.
  4. Clear abuse reporting mechanism provided.
  5. No privacy or cookie consent banners present on this page.
  6. No social media links or phone numbers found.
  7. No security headers detected in provided data.
  8. WHOIS data for this subdomain is not available, typical for subdomains.
  9. No signs of adult or questionable content.
Technical notes

Notes

The website is built using standard HTML5 and CSS3 with Bootstrap 5.1.3 for responsive design. The site loads external CSS from a CDN (jsdelivr.net), indicating use of modern web delivery practices. There are no detected CMS platforms or complex backend technologies visible from the front-end content. Performance is moderate with no explicit performance optimizations noted. The site is mobile-optimized and has a clean, minimalistic design suitable for its technical purpose. Lack of explicit security headers and cookie consent mechanisms are technical gaps. The WHOIS data absence is typical for subdomains and does not indicate technical risk. Overall, the technical infrastructure is stable but could benefit from enhanced security and privacy features.
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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