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Security report for sendy.co

Domains By Proxy, LLC · Technology · United States

Medium risk. 7 critical or high findings in Security headers, GDPR outside view and 2 other checks.

Security score

56/100

Risk levelMedium

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

Sendy.co is a technology company offering a self-hosted email newsletter application that enables users to send bulk emails cost-effectively via Amazon Simple Email Service (SES). The business model centers on a one-time software license purchase combined with pay-per-email sending fees, positioning Sendy as a cost-efficient alternative to traditional hosted email marketing platforms. The website demonstrates a strong market position with clear value propositions, including high deliverability and significant cost savings, supported by customer testimonials and integrations with popular SMTP providers.

Scanned

This is an earlier scan of sendy.co. View the latest report

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

7 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 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 sendy.co

This scan found 24 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

€39.90one-time

  • The complete analysis as a PDF you can cite
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  • Lifetime access to this report

Prices incl. 21% VAT. Secure checkout by Mollie; sold by SEQ SIA, Latvia.

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
77
Security headers
15
Email security
80
DNS health
70
Network security
40
GDPR outside view
53
Average
56

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 sendy.co, from OffSeq Breach.

Total records
443
Employees
103
Customers
274
Third parties
66
Weak passwords
16%

Latest record dated 2026-06-17 · 5 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 sendy.co.

Select it in the checkout above.

Masked preview

  • –sendy.co2026-06-17
  • –sendy.co2026-06-13
  • –sendy.co2026-06-08
  • –sendy.co2026-05-28
  • –sendy.co2026-05-28

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

The company targets businesses and marketers seeking affordable and scalable email marketing solutions. Its competitive advantage lies in leveraging Amazon SES for email delivery, which reduces costs substantially compared to competitors charging monthly fees based on subscriber counts. The business model is straightforward, relying on software sales and Amazon SES usage fees. The presence of payment integrations with PayPal and Stripe facilitates smooth transactions. The ecosystem includes partnerships with SMTP providers and third-party integrations via Zapier, enhancing product versatility. The domain's long-standing registration and privacy protection are consistent with software vendors, supporting legitimacy.

Security posture

The website employs HTTPS and secure payment gateways (PayPal and Stripe), indicating a baseline security posture. However, the absence of DNSSEC, security headers, and published security or incident response policies suggests room for improvement. Input validation is implemented on forms, reducing injection risks. No critical vulnerabilities or exposed sensitive data were detected. The lack of cookie consent mechanisms and GDPR compliance indicators may pose compliance risks. Overall, the security maturity is moderate but could be enhanced by adopting additional best practices and transparency measures.

Recommendations

  1. Enable DNSSEC on the domain to improve DNS security and prevent spoofing.
  2. Implement standard security headers such as Content-Security-Policy, X-Frame-Options, and X-XSS-Protection to mitigate common web vulnerabilities.
  3. Add a cookie consent banner or mechanism to comply with GDPR and other privacy regulations.
  4. Publish a comprehensive security policy and incident response plan to enhance transparency and user trust.
  5. Develop and publish terms of service to clarify user rights and obligations.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Domains By Proxy, LLC
Description
Sendy is a self hosted newsletter application that lets you send trackable emails via Amazon Simple Email Service (SES) at 100x cheaper than other hosted solutions.
Key services
Self-hosted newsletter software, Bulk email sending via Amazon SES, Email campaign reporting, Autoresponders, List segmentation, Client account management, Third party integrations
Content quality
excellent
Branding
consistent

Technology

Stack
PHP, MySQL, jQuery, Bootstrap, Amazon SES, Stripe, PayPal, Matomo Analytics
Frameworks
Bootstrap
Platforms
Self-hosted web application
Performance
fast
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
70/100
Good practices seen
  • HTTPS enforced
  • No exposed sensitive data in HTML
  • Use of PayPal and Stripe for secure payments
  • Input validation on purchase form

Analytics and tracking

Services
Matomo, Google Analytics (gtag.js)
Tracking level
moderate
Privacy practices
basic

Advertising

Tracking pixels
Matomo
Marketing tools
Matomo Analytics, Zapier integration
Transparency
basic

Site quality

Design
excellent
User experience
excellent
Content relevance
excellent
Navigation
excellent
Professionalism
excellent
Trustworthiness
high

Key observations

  1. Website is a self-hosted newsletter software product leveraging Amazon SES for cost-effective email delivery.
  2. Clear business model with one-time license fee and pay-per-email sending cost.
  3. No phone contact information provided; contact primarily via email and contact forms.
  4. No explicit cookie consent mechanism despite use of tracking scripts.
  5. No published security or incident response policies.
  6. Good use of modern web technologies and payment integrations.
  7. WHOIS data shows privacy protection but domain age and status indicate legitimacy.
  8. No DNSSEC enabled; security headers not detected in provided data.
  9. Strong customer testimonials and social proof present.
  10. No terms of service page detected.
Technical notes

Notes

The website is built on a modern technology stack including PHP, MySQL, jQuery, and Bootstrap, hosted on AWS infrastructure with CloudFront CDN for performance optimization. Payment processing is integrated via PayPal and Stripe, ensuring secure transactions. Analytics are handled through Matomo and Google Analytics, providing user behavior insights. The site is mobile-optimized with good SEO practices and clear navigation. Technical debt appears low, with opportunities to enhance security configurations and privacy compliance. Performance is fast, and accessibility is basic but functional.
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. 56/100Medium32 findingsView report
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