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Security report for mimecast.com

Mimecast · Technology · United Kingdom

Low risk. 5 critical or high findings in Security headers and GDPR outside view.

Security score

78/100

Risk levelLow

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

Mimecast is a leading 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 offers a comprehensive suite of products including threat protection, insider risk management, data compliance, and security awareness training. The company is headquartered in the United Kingdom and has a strong global presence. Technically, Mimecast's website is hosted on Microsoft Azure and uses Sitecore Content Hub as its CMS, with modern web technologies and good mobile optimization. Security-wise, the site implements strong HTTP security headers and secure cookie practices, though the SSL/TLS configuration lacks enabled protocols which should be addressed. Overall, Mimecast demonstrates a mature digital presence with strong branding, trust indicators, and compliance posture.

Scanned

This is an earlier scan of mimecast.com. View the latest report

NIS2 and GDPR posture

GDPR outside view
25/ 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

5 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 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

    • 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

    • High

      Third-party services without privacy policy

      Detected services: Google Analytics, Facebook, Twitter, LinkedIn, YouTube

      What to do: Document all third-party data sharing in your privacy policy

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

Keep watching mimecast.com

This scan found 13 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

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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
92
Security headers
80
Email security
85
DNS health
85
Network security
100
GDPR outside view
25
Average
78

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, focusing on cybersecurity solutions for enterprises. Its business model is B2B SaaS, targeting organizations that require advanced email and collaboration security. The company leverages AI to enhance threat detection and human risk management, positioning itself as a market leader recognized by Gartner. Mimecast's extensive partner network and integrations with over 300 platforms strengthen its market reach and customer value proposition. The company emphasizes compliance and data protection, aligning with global regulations such as GDPR. Growth indicators include a large customer base, multiple product offerings, and active engagement in industry events and resources.

Security posture

Mimecast exhibits a strong security posture with multiple best practices implemented, including HSTS, secure cookies, and protection against common web vulnerabilities. The absence of DNSSEC and CAA records indicates areas for improvement in DNS security. The SSL certificate is valid and issued by a reputable CA, but the lack of enabled TLS protocols suggests a potential misconfiguration or scanning anomaly that should be remediated. No direct incident response or security policy pages were found, which could be enhanced to improve transparency and readiness. The company provides a responsible disclosure page, indicating openness to vulnerability reporting. Overall, Mimecast maintains a robust security framework suitable for its enterprise clientele.

Recommendations

  1. Enable TLS 1.2 or higher protocols to ensure secure encrypted communications.
  2. Implement DNSSEC and CAA DNS records to enhance domain and certificate security.
  3. Publish detailed security policies and incident response procedures on the website.
  4. Add a security.txt file to facilitate vulnerability disclosure and improve security transparency.
  5. Consider enabling HSTS preload to strengthen HTTPS enforcement across browsers.

Contact details published on the site

Addresses
Legal name
Mimecast Services Limited
Technical notes

Notes

The website is built on a modern technology stack including JavaScript, Google Tag Manager, and Sitecore Content Hub CMS, hosted on Microsoft Azure. Performance metrics indicate fast load times and good mobile optimization. The site uses structured data (JSON-LD) for organization and website schema, enhancing SEO. Security headers are well configured, but SSL/TLS protocol support is missing or disabled, which is a critical technical risk. The site integrates multiple external resources and partner domains, reflecting a complex but well-managed infrastructure. Opportunities exist to improve DNS security and SSL configuration to reduce technical debt and enhance resilience.
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. 84/100Low15 findingsView report
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