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Security report for mailman3.com

New IT · Technology · N/a

Medium risk. 4 critical or high findings in Security headers, SSL/TLS and 1 other check.

Security score

70/100

Risk levelMedium

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

Mailman3.com is a specialized SaaS provider offering hosted Mailman 3 mailing list management services. The company provides multiple subscription plans including shared, dedicated, reseller, and enterprise options, targeting organizations requiring robust email list management and delivery. The business operates with a clear focus on Mailman 3 technology but is unaffiliated with the official Mailman 3 developers. The website presents a professional image with clear service descriptions and pricing, supported by modern web technologies including Google Analytics and Stripe for payments. However, it lacks formal privacy and terms of service documentation, which may impact user trust and compliance. Security posture is moderate with HTTPS enabled and no visible sensitive data exposure, but improvements such as DNSSEC and security headers are recommended. Overall, the domain registration is consistent and trustworthy, supporting the legitimacy of the business.

Scanned

NIS2 and GDPR posture

GDPR outside view
83/ 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

4 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 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. 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

  3. DNS health

    DNS sends visitors and email to the right servers. Misconfigured records can cause outages or let someone redirect your traffic.

    • High

      Weak SPF Policy

      SPF record has permissive policy allowing any server to send email

      What to do: Use -all or ~all qualifier for better email security

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

Keep watching mailman3.com

This scan found 23 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
85
DNS health
60
Network security
100
GDPR outside view
83
Average
70

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

The company positions itself as a niche provider in the mailing list hosting market, leveraging the open-source Mailman 3 platform. Its subscription-based model with tiered plans caters to a range of customers from small websites to enterprise clients. The presence of an open-source support initiative indicates community engagement. The partnership with New IT suggests a stable operational base. The lack of phone or physical address information limits direct contact options but the consistent use of a professional contact email supports credibility. The business appears small but focused, with growth potential in specialized email hosting services.

Security posture

The website employs HTTPS and integrates secure payment processing via Stripe, indicating baseline security awareness. However, the absence of DNSSEC, security headers, and published security policies suggests room for improvement in defense-in-depth strategies. No incident response or vulnerability disclosure information is available, which could hinder timely handling of security events. The cookie consent mechanism is implemented, supporting privacy compliance to some extent. Overall, the security maturity is moderate but would benefit from formalized policies and enhanced technical controls.

Recommendations

  1. Publish a comprehensive privacy policy and terms of service to improve compliance and user trust.
  2. Enable DNSSEC on the domain to enhance DNS security.
  3. Implement security headers such as Content Security Policy (CSP), HSTS, and X-Frame-Options.
  4. Create and publish a vulnerability disclosure policy or security.txt file to facilitate responsible reporting.
  5. Consider adding incident response contact information and formal security policies on the website.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
New IT
Description
Mailman3.com offers hosted Mailman 3 mailing list management services including shared, dedicated, reseller, and enterprise plans with features like unlimited lists, rock solid email delivery, and added value services.
Key services
Mailman 3 server hosting, Unlimited mailing lists and members, Email delivery services, API integration, AI Moderator, Premium support, Branding and reseller authorization
Content quality
good
Branding
consistent

Technology

Stack
Google Tag Manager, Google Analytics, Bugsnag, Stripe.js, Cookie-bar.js
Performance
moderate
Mobile
basic
Accessibility
basic
SEO
basic

Security

Observed score
60/100
Good practices seen
  • HTTPS enabled
  • No exposed sensitive data in HTML
  • Use of secure payment integration (Stripe)

Analytics and tracking

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

Advertising

Tracking pixels
Bugsnag
Transparency
basic

Site quality

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

Key observations

  1. Website is a niche SaaS provider for Mailman 3 mailing list hosting.
  2. No privacy policy or terms of service pages found.
  3. Cookie consent banner present and functional.
  4. Contact email is consistent and professional.
  5. No phone numbers or physical addresses found.
  6. No social media links detected.
  7. Use of modern analytics and payment technologies.
  8. No explicit security or incident response policies published.
  9. No DNSSEC enabled on domain.
  10. Website content is professional and relevant to target audience.
Technical notes

Notes

The website uses a modern technology stack including Google Tag Manager, Google Analytics, Bugsnag for error monitoring, and Stripe for payment processing. The HTML structure is valid and the design is professional with clear navigation and subscription options. Performance is moderate with basic mobile optimization and accessibility features. No CMS is detected, suggesting a custom or static site approach. Hosting provider details are not explicit but domain registrar is GoDaddy. The site could improve SEO and accessibility with enhanced meta tags and ARIA attributes. Overall, the technical implementation supports the business model but has opportunities for modernization and security enhancements.
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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