Skip to main content

Security report for mailjet.com

Mailjet: Email Delivery Service for Marketing & Developer Teams · Technology · N/a

Low risk. 2 critical or high findings in SSL/TLS.

Security score

82/100

Risk levelLow

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

Mailjet is a large, established SaaS company specializing in email marketing software and email APIs designed for marketing and developer teams. The platform offers a comprehensive suite of services including email marketing, transactional email delivery, automation, segmentation, and deliverability solutions. It targets enterprises and teams requiring reliable and GDPR-compliant email solutions. The website demonstrates a high level of digital maturity with a modern WordPress CMS, Bootstrap framework, and integration of analytics and SEO tools. The content is professionally presented, mobile-optimized, and rich in relevant business information. Security posture is strong with HTTPS and secure form usage, though explicit security policies and vulnerability disclosures are absent. WHOIS data is unavailable, which slightly reduces trust but is not uncommon for SaaS providers. Overall, the website is trustworthy, professional, and well-positioned in the email marketing technology sector.

Scanned

NIS2 and GDPR posture

GDPR outside view
95/ 100 · Low
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

2 findings rated critical or high. Fix these first.

  1. 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
    • High

      Weak SSL Key Length

      SSL certificate uses 256-bit key, which is considered weak

      What to do: Use at least 2048-bit RSA or 256-bit ECC key

      • CWE-326
      • OWASP A04:2025
      • Mozilla TLS: Mozilla Server Side TLS 6.0 intermediate: rsa_key_size 2048

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

Keep watching mailjet.com

This scan found 15 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

Email alerts on material changes and an exportable JSON history of every change.

Billed monthly to your card. Cancel anytime. The full timeline opens with your unlock code.

Full report

€39.90one-time

  • The complete analysis as a PDF you can cite
  • Email delivery with an unlock code
  • Lifetime access to this report

Prices incl. 21% VAT. Secure checkout by Mollie; sold by SEQ SIA, Latvia.

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
85
Email security
72
DNS health
85
Network security
100
GDPR outside view
95
Average
82

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 operates as a SaaS provider under the Sinch umbrella, serving over 100,000 customers globally. Its business model focuses on subscription-based email marketing and API services, catering to marketing teams and developers. The company leverages partnerships with services like Mailgun and Email on Acid to enhance its offerings. The website content and structure indicate a mature business with a strong market presence, targeting industries such as small businesses, agencies, enterprises, real estate, franchises, and MarTech. The platform supports advanced features like AI email generation and real-time collaboration, signaling innovation and competitive advantage. The absence of direct contact emails or phone numbers suggests a focus on managed customer engagement via forms and sales channels.

Security posture

The website enforces HTTPS and uses modern security best practices in form handling and script loading. However, it lacks explicit security headers in the provided content and does not publish a dedicated security policy or incident response information. No vulnerability disclosure or security.txt file is present, which could hinder transparency and incident management. The WHOIS data is not publicly available, which may be due to privacy protection but reduces domain registration transparency. Overall, the security posture is good but could be improved by publishing clear security policies, incident response contacts, and vulnerability disclosure mechanisms.

Recommendations

  1. Publish a comprehensive privacy policy and cookie consent mechanism to improve privacy compliance.
  2. Add explicit security headers such as X-Frame-Options and X-Content-Type-Options to enhance security posture.
  3. Create and publish a security policy page including incident response contacts and vulnerability disclosure information.
  4. Provide verified company contact emails and phone numbers for sales, support, and security inquiries to improve trust and accessibility.
  5. Regularly audit third-party scripts and dependencies to ensure no vulnerable libraries are included.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Mailjet: Email Delivery Service for Marketing & Developer Teams
Description
Design, deliver, and automate marketing & transactional emails together with built-in deliverability, GDPR compliance, and developer-ready email APIs
Key services
Email Marketing, Email API, Transactional Email Delivery, Email Automation, Email Validations, SMTP Relay, Dedicated IP, Parse API, Landing Pages, AI Email Generator
Content quality
excellent
Branding
consistent

Technology

Stack
WordPress, Yoast SEO plugin, Bootstrap, Google Tag Manager, Google Analytics, Sinch Core plugin, MJML (Email templating)
Frameworks
Bootstrap
Platforms
WordPress
Performance
fast
Mobile
excellent
Accessibility
good
SEO
excellent

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • No exposed sensitive data in HTML
  • Use of secure forms
  • No visible vulnerable libraries

Analytics and tracking

Services
Google Analytics, Google Tag Manager
Tracking level
moderate
Privacy practices
basic

Advertising

Marketing tools
Yoast SEO
Transparency
good

Site quality

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

Key observations

  1. Website is fully accessible with rich content and navigation
  2. No WHOIS data available, possibly due to privacy or registry issues
  3. Strong branding and professional design
  4. No explicit privacy or cookie policy pages detected in provided HTML
  5. Contact available only via forms, no direct emails or phone numbers found
  6. Use of modern web technologies and SEO best practices
  7. No security.txt or vulnerability disclosure found
  8. No explicit security or incident response policies found on site
Technical notes

Notes

The website is built on WordPress CMS with Bootstrap for responsive design and uses Yoast SEO for search engine optimization. It integrates Google Tag Manager and Google Analytics for tracking and analytics. The site loads fonts and scripts asynchronously for performance optimization. The presence of MJML indicates advanced email template rendering capabilities. The site is mobile-optimized with good accessibility features and fast loading times. No hosting provider information is explicitly found. The technical implementation is modern and robust, supporting a professional SaaS offering.
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. 82/100Low21 findingsView report
  2. 75/100Medium18 findings · partial scanView report
Reviews of this site

Share your experience with mailjet.com. Every review is verified by email and published after moderation.

Overall rating
Select a rating
4000 characters remaining

We’ll email you to confirm your review and keep your details private.

Community rating

No published reviews yet. Be the first to review mailjet.com.

Feedback on this report

Rate this report, add an optional comment, and tell us if you want a security specialist to follow up.

Overall report quality
Select a rating
2000 characters remaining

We only use your feedback to improve Guard reports. Contact details are never shared.