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Security report for mimecast.com

Mimecast · Technology · United Kingdom

Low risk. 3 critical or high findings in Security headers and GDPR outside view.

Security score

84/100

Risk levelLow

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

Mimecast is a well-established enterprise cybersecurity company specializing in AI-powered email security and human risk management solutions. With over 42,000 customers and a broad partner ecosystem, Mimecast positions itself as a leader in the email security market. The website reflects a mature digital presence with comprehensive content, multi-language support, and strong branding consistency. Technically, the site uses modern web technologies including Sitecore CMS, Google Tag Manager, and Web Vitals for performance monitoring. Security posture is strong with HTTPS enforced and no visible vulnerabilities, though some security headers and explicit incident response contacts could be improved. Privacy compliance is well addressed with clear privacy and cookie policies and GDPR considerations. The absence of WHOIS data limits domain registration trust analysis but does not detract significantly from the overall legitimacy given the professional web presence and business information. Overall, Mimecast's website demonstrates a high level of professionalism, security awareness, and business credibility.

Scanned

NIS2 and GDPR posture

GDPR outside view
53/ 100 · Medium
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

3 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 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 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

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

Keep watching mimecast.com

This scan found 11 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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Recommended

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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
100
Security headers
80
Email security
83
DNS health
90
Network security
100
GDPR outside view
53
Average
84

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

Breach exposure

Leaked credentials and lookalike domains from OffSeq Breach. The counts are free; the detailed lists are paid add-ons.

Dark web exposure

Add-on

Leaked records that mention mimecast.com, from OffSeq Breach.

Total records
27,941
Employees
2
Customers
27,781
Third parties
158
Weak passwords
11%

Latest record dated 2025-07-26 · 1,238 subdomains affected

See the 10 newest leaked credentials

A one-off add-on to this report that lists the most recent identifier and password pairs OffSeq Breach holds for mimecast.com.

Select it in the checkout above.

Masked preview

  • –login-uk.mimecast.com2025-07-26
  • –mimecast.com2025-07-19

Breach keeps ingesting new leaks, so these numbers can grow between scans.

Open in Breach(opens in a new tab)Monitor on Breach(opens in a new tab)

Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

Mimecast operates in the technology sector providing cybersecurity solutions focused on email and collaboration threat protection, insider risk management, data governance, and security awareness training. The company leverages a SaaS business model targeting enterprise customers globally. Its market position is strong, supported by Gartner recognition and a large partner network. Mimecast's revenue streams likely include subscription services, partner programs, and professional services. The company emphasizes AI integration and human risk management as competitive advantages. The website's content and partner integrations indicate a strategic focus on interoperability and ecosystem expansion. Growth indicators include extensive customer base, global offices, and continuous product innovation. Mimecast's operations reflect a mature and scalable cybersecurity business with a focus on trust and compliance.

Security posture

Mimecast's website security posture is robust with HTTPS enforced and no exposed sensitive information. The site uses secure forms and does not reveal vulnerable libraries or outdated components. However, explicit security headers such as Content Security Policy (CSP), HTTP Strict Transport Security (HSTS), and X-Frame-Options are not visibly present and should be implemented to enhance protection against common web attacks. The company provides a responsible disclosure page, indicating a proactive approach to vulnerability management, though no security.txt file was detected. Privacy policies and cookie consent mechanisms are comprehensive and GDPR compliant. Incident response contact information is not explicitly provided on the site, which could be improved for transparency. Overall, Mimecast demonstrates a mature security culture but could enhance web security best practices and public incident response readiness.

Recommendations

  1. Implement and publish comprehensive security headers (CSP, HSTS, X-Frame-Options) to strengthen web security.
  2. Add a security.txt file at the root domain to facilitate vulnerability reporting and improve transparency.
  3. Provide explicit incident response contact information on the website to enhance trust and readiness.
  4. Regularly audit and update third-party scripts and dependencies to mitigate potential vulnerabilities.
  5. Enhance visibility of certifications and compliance attestations to reinforce market trust.

Contact details published on the site

Addresses
Legal name
Mimecast Services Limited
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Mimecast
Description
Protect email and collaboration tools with Mimecast. Manage human risk and stay ahead of cyber threats with advanced security solutions.
Key services
Advanced Email Security, Insider Risk Management, Data Compliance & Governance, Security Awareness & Training, Collaboration Threat Protection, Human Risk Command Center
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, Google Tag Manager, Web Vitals, Sitecore Content Hub (implied by content URLs), CSS3, HTML5
Performance
moderate
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • No exposed sensitive data in HTML
  • Secure forms with no visible vulnerabilities

Analytics and tracking

Services
Google Tag Manager, Web Vitals
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
Web Vitals
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. Strong branding and consistent messaging around AI-powered email security
  3. Multiple language support and global presence indicated
  4. No signs of phishing, malware, or suspicious content
  5. No exposed sensitive data or security misconfigurations detected
  6. WHOIS data unavailable, limiting domain registration trust analysis
Technical notes

Notes

The website is built on a modern technology stack including Sitecore CMS, JavaScript frameworks, and integrates Google Tag Manager and Web Vitals for analytics and performance monitoring. The site is mobile responsive with good accessibility features and SEO optimization. Performance is moderate with room for improvement in loading speed and resource optimization. The use of multiple external domains for content delivery and integrations is well managed. No critical technical debt or deprecated technologies were detected. Opportunities exist to improve security headers and streamline third-party script usage to reduce attack surface and improve performance.
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. 78/100Low19 findingsView report
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