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Security report for postfix.org

Technology · N/a

Medium risk. 8 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

59/100

Risk levelMedium

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

The Postfix website serves as the official home page for the Postfix mail server project, an open source software developed initially at IBM research and maintained by Wietse Venema. The site provides basic informational content about the software, its history, and links to resources such as downloads, documentation, and mailing lists. The target audience primarily includes system administrators and IT professionals seeking a reliable mail server solution. The business model is centered on open source distribution with additional packaging by third parties. Technically, the website is simple, built with basic HTML and CSS, lacking modern frameworks or CMS, and shows minimal optimization for mobile or accessibility. Security posture is limited, with no HTTPS or security headers detected, and no published privacy or security policies. The WHOIS data is unavailable or malformed, limiting domain trust verification, but the site content and external references suggest legitimacy. Overall, the site is functional but basic, with room for improvements in security, privacy compliance, and technical modernization.

Scanned

NIS2 and GDPR posture

GDPR outside view
35/ 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

8 findings rated critical or high. Fix these first.

  1. 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';…

  2. GDPR outside view

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • 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

    • 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

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

Keep watching postfix.org

This scan found 25 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.

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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
65
Security headers
15
Email security
70
DNS health
70
Network security
100
GDPR outside view
35
Average
59

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

Postfix holds a strong position as a well-known open source mail server alternative to Sendmail, with a long history and active maintenance by its original author. Its business model relies on community and vendor distribution rather than direct commercial sales. The website reflects a small-scale operation focused on providing technical resources rather than commercial services. There are no indications of partnerships or subsidiaries from the website content. The lack of contact information and policies may limit broader enterprise adoption or trust signals. The project targets a niche technical audience, primarily system administrators and organizations requiring mail server solutions. Growth indicators or revenue streams are not evident from the site.

Security posture

The website exhibits a low security maturity level. It lacks HTTPS, security headers, and published security or incident response policies. No vulnerability disclosure or security.txt files are present. The absence of contact information for security incidents further reduces readiness. While the software itself is described as secure and actively maintained, the website does not reflect strong security best practices. There are no visible vulnerabilities or exposed sensitive data on the site. Compliance with GDPR or other data protection regulations is not demonstrated. Overall, the security posture is basic and could benefit from significant improvements to align with modern standards.

Recommendations

  1. Implement HTTPS with a valid SSL/TLS certificate to secure all site traffic.
  2. Add standard security headers such as Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security.
  3. Publish a clear privacy policy and cookie consent mechanism to improve privacy compliance.
  4. Provide contact information specifically for security incidents and vulnerability disclosures.
  5. Enhance mobile optimization and accessibility to improve user experience and compliance.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Description
Postfix is a mail server software originally developed by Wietse Venema at IBM research as an alternative to Sendmail. It is designed to be fast, easy to administer, and secure. Postfix runs on UNIX-like systems and is also distributed by OS and appliance vendors.
Key services
Mail server software development and distribution
Content quality
basic
Branding
moderate

Technology

Stack
HTML, CSS
Platforms
UNIX-like systems
Performance
moderate
Mobile
poor
Accessibility
basic
SEO
basic

Security

Observed score
30/100

Analytics and tracking

Tracking level
minimal
Privacy practices
poor

Advertising

Transparency
poor

Site quality

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

Key observations

  1. Website is a basic informational site for the Postfix mail server project.
  2. No privacy, cookie, or terms of service policies are present.
  3. No contact emails or phone numbers are provided on the site.
  4. No security or incident response policies are published.
  5. No analytics or tracking scripts detected.
  6. No modern web technologies or CMS detected; simple HTML and CSS only.
  7. No advertising or marketing tools present.
  8. WHOIS data is unavailable or malformed, limiting domain trust verification.
  9. Site content is safe and technical in nature.
  10. No WAF or blocking mechanisms detected.
Technical notes

Notes

The website is built using simple HTML and CSS without modern frameworks or CMS. It lacks responsive design and accessibility features. No analytics or tracking scripts are present, indicating minimal data collection. The site performance is likely moderate given the simplicity but lacks optimization for mobile devices. The absence of HTTPS and security headers represents a technical risk. The WHOIS data is incomplete or unavailable, which may indicate privacy protection or registry restrictions but reduces transparency. Overall, the technical infrastructure is minimal and could be modernized to improve security, performance, 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

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