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Security report for maileon.cz

Mailnatives s.r.o. · Technology · Czech Republic

Medium risk. 10 critical or high findings in GDPR outside view, Email security and 3 other checks.

Security score

53/100

Risk levelMedium

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

Maileon.cz is a Czech Republic-based email marketing platform operated by Mailnatives s.r.o., founded in 2016. The company offers a professional SaaS solution for managing email campaigns and transactional emails, focusing on intelligent emailing with features such as segmentation, automation, tracking, and API integration. The website presents a professional and consistent brand image targeting businesses and marketing professionals in the Czech and CEE regions. Technically, the site uses standard web technologies including HTML5, CSS3, JavaScript, and jQuery, with embedded YouTube video content. While the site is mobile optimized and accessible, some technical aspects such as the use of an outdated jQuery version and lack of visible security headers suggest room for improvement. Security posture is moderate with no critical vulnerabilities detected but lacking explicit security policies and headers. Privacy compliance is weak due to the absence of privacy and cookie policies despite GDPR badges displayed. Overall, the website is trustworthy and professionally maintained but would benefit from enhanced privacy and security documentation to improve compliance and user trust.

Scanned

NIS2 and GDPR posture

GDPR outside view
10/ 100 · Critical
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

10 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 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

  2. Email security

    SPF, DKIM and DMARC stop others sending email that looks like it comes from your domain, a common route to phishing and invoice fraud.

    • Critical

      No email authentication configured

      Domain is vulnerable to email spoofing

      What to do: Implement SPF, DKIM, and DMARC immediately

  3. 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"

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

Keep watching maileon.cz

This scan found 28 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.

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Full report

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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
62
Security headers
30
Email security
60
DNS health
55
Network security
100
GDPR outside view
10
Average
53

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

Maileon operates in the technology sector providing email marketing and transactional email services primarily to businesses in the Czech Republic and CEE region. The company leverages a SaaS business model with key services including campaign management, customer profiling, segmentation, automation, and API integration. The presence of reputable client logos such as Bosch and Lufthansa indicates a solid market position and trust. The company is small-sized but shows professional branding and a clear focus on email marketing technology. Its partnership with Mailnatives s.r.o. strengthens its regional presence. The website content and structure support lead generation through demo offers and newsletter subscriptions, indicating a growth-oriented approach. However, the lack of detailed privacy and security policies may impact customer confidence in regulated markets.

Security posture

The website demonstrates a moderate security posture with HTTPS assumed but not explicitly confirmed in the data. No security headers such as Content Security Policy or HSTS were detected, and the use of an outdated jQuery version (1.10.2) could pose potential security risks. There is no visible incident response or vulnerability disclosure information, which limits transparency in security management. The site does not expose sensitive data in the HTML, and forms appear to be standard with required email input for newsletter subscription. GDPR compliance is indicated by badges but lacks supporting documentation. Overall, the security maturity is adequate for a small technology service provider but requires improvements in security headers, updated libraries, and published security policies to enhance resilience and compliance.

Recommendations

  1. Publish comprehensive privacy and cookie policies clearly accessible from the website footer or main menu.
  2. Implement and configure security headers such as Content Security Policy (CSP), HTTP Strict Transport Security (HSTS), X-Frame-Options, and X-Content-Type-Options.
  3. Update JavaScript libraries, especially jQuery, to the latest secure versions to mitigate known vulnerabilities.
  4. Provide a dedicated security or incident response contact channel and consider publishing a vulnerability disclosure policy or security.txt file.
  5. Enhance GDPR compliance by detailing data protection practices, data retention policies, and appointing or disclosing a Data Protection Officer contact.

Contact details published on the site

Addresses
Legal name
Mailnatives s.r.o.
Registration number
07891768
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Mailnatives s.r.o.
Description
Maileon is a professional solution for managing email campaigns and transactional messages, offering intelligent emailing with proven results, including features like deliverability, segmentation, automation, tracking, and integration.
Key services
Email campaign management, Transactional email delivery, Customer tracking and profiling, Segmentation and automation, API integration, Visual newsletter editor
Content quality
good
Branding
consistent

Technology

Stack
HTML5, CSS3, JavaScript, jQuery 1.10.2, YouTube iframe API
Performance
moderate
Mobile
good
Accessibility
good
SEO
basic

Security

Observed score
60/100
Good practices seen
  • No exposed sensitive data in HTML
  • Use of HTTPS assumed but not confirmed from data

Analytics and tracking

Tracking level
minimal
Privacy practices
poor

Advertising

Marketing tools
YouTube iframe API
Transparency
basic

Site quality

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

Key observations

  1. Website is fully accessible with no blocking or WAF challenges.
  2. No privacy or cookie policies are linked or found on the site.
  3. Contact information is clearly provided including email, phone, and physical address.
  4. The site uses older jQuery version (1.10.2) which may have security implications.
  5. No explicit security headers detected in the provided data.
  6. The site promotes GDPR compliance but lacks explicit privacy documentation.
  7. The business is small-sized, focused on email marketing technology in Czech Republic and CEE region.
  8. Good branding consistency and professional design.
  9. No social media links explicitly found in the HTML content.
  10. No terms of service or incident response information found.
Technical notes

Notes

The website is built using standard web technologies including HTML5, CSS3, and JavaScript with jQuery 1.10.2 and YouTube iframe API for video embedding. The site uses responsive design techniques and Google Fonts for typography. No CMS or specific web frameworks were detected. Hosting provider details are not available from the data. Performance is moderate with no explicit speed optimizations noted. Accessibility features such as skip links and access keys are implemented, improving usability. SEO optimization is basic with meta keywords and description tags present but no Open Graph or structured data found. The site could benefit from modernization of its JavaScript libraries and enhanced SEO metadata for better search engine visibility.
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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