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feat(email): Email testing suite — design rendering + delivery testing + health check enhancements (t214)#920

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feat(email): Email testing suite — design rendering + delivery testing + health check enhancements (t214)#920
marcusquinn wants to merge 1 commit intomainfrom
feature/t214

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@marcusquinn
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Summary

  • New email-test-suite-helper.sh — comprehensive email testing covering design rendering validation (HTML structure, CSS client compatibility, dark mode, responsive design) and delivery testing (SMTP connectivity, header analysis, inbox placement scoring, TLS certificate checks)
  • Enhanced email-health-check-helper.sh — added BIMI, MTA-STS, TLS-RPT, DANE, and reverse DNS checks with a 15-point health scoring system (letter grades A-F)
  • New documentationservices/email/email-testing.md subagent doc, commands/email-test-suite.md slash command, updated subagent index

Changes

New Files

File Purpose
.agents/scripts/email-test-suite-helper.sh Design rendering + delivery testing suite
.agents/services/email/email-testing.md Subagent documentation
.agents/scripts/commands/email-test-suite.md Slash command definition

Modified Files

File Change
.agents/scripts/email-health-check-helper.sh +5 new checks (BIMI, MTA-STS, TLS-RPT, DANE, rDNS) + scoring system
.agents/services/email/email-health-check.md Document enhanced checks and scoring
.agents/subagent-index.toon Register new script and update descriptions

Design Rendering Tests

  • HTML structure validation (DOCTYPE, charset, viewport, table layout, inline styles, image alt text, Gmail 102KB clip limit)
  • CSS compatibility (detects flexbox, grid, position, float, animations that break in Outlook/Gmail/Yahoo)
  • Dark mode compatibility (color-scheme meta, prefers-color-scheme, hardcoded colors, transparent PNGs)
  • Responsive design (viewport, fixed widths, media queries, MSO conditionals, font sizes, touch targets)
  • Test email template generation

Delivery Testing

  • SMTP connectivity (TCP, banner, STARTTLS/TLS)
  • Domain SMTP (auto-discover MX, test primary server)
  • Email header analysis (SPF/DKIM/DMARC results, delivery path, spam indicators, List-Unsubscribe/RFC 8058)
  • Inbox placement scoring (10-point scale across 9 factors)
  • TLS certificate validation (expiry, version, SAN)

Health Check Enhancements

  • BIMI record check (brand logo, VMC certificate)
  • MTA-STS check (DNS record + policy file)
  • TLS-RPT check (reporting URI)
  • DANE/TLSA check (with DNSSEC detection)
  • Reverse DNS / FCrDNS check
  • Health scoring: 15-point scale, letter grades A-F

Verification

  • bash -n syntax check: PASS (both scripts)
  • ShellCheck: 0 violations (both scripts)
  • Help command: PASS (both scripts)
  • Smoke test suite: 192/192 syntax, 128/128 help commands
  • Functional test: generated test email, ran full design suite against it

Task

Closes t214

…testing, and enhanced health checks (t214)

New email-test-suite-helper.sh provides:
- Design rendering validation (HTML structure, CSS compatibility, dark mode, responsive)
- Delivery testing (SMTP connectivity, header analysis, inbox placement scoring, TLS checks)
- Test email template generation for rendering verification

Enhanced email-health-check-helper.sh with:
- BIMI, MTA-STS, TLS-RPT, DANE, and reverse DNS checks
- Health scoring system (15-point scale with letter grades A-F)
- Score breakdown across all authentication and security checks

Decision: combined design rendering and delivery testing into single script
(matches existing pattern of comprehensive helper scripts like ses-helper.sh)
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  • Commit unit tests in branch feature/t214

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🔍 Code Quality Report

�[0;35m[MONITOR]�[0m Code Review Monitoring Report

�[0;34m[INFO]�[0m Latest Quality Status:
SonarCloud: 0 bugs, 0 vulnerabilities, 33 code smells

�[0;34m[INFO]�[0m Recent monitoring activity:
Tue Feb 10 05:33:34 UTC 2026: Code review monitoring started
Tue Feb 10 05:33:34 UTC 2026: SonarCloud - Bugs: 0, Vulnerabilities: 0, Code Smells: 33

📈 Current Quality Metrics

  • BUGS: 0
  • CODE SMELLS: 33
  • VULNERABILITIES: 0

Generated on: Tue Feb 10 05:33:37 UTC 2026


Generated by AI DevOps Framework Code Review Monitoring

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Quality Gate Failed Quality Gate failed

Failed conditions
2 Security Hotspots

See analysis details on SonarQube Cloud

@marcusquinn marcusquinn deleted the feature/t214 branch February 10, 2026 05:47
marcusquinn added a commit that referenced this pull request Feb 10, 2026
- Replace /dev/tcp with nc for SMTP connectivity testing (S5332: clear-text protocol)
- Enforce HTTPS-only with --proto =https on curl for MTA-STS policy fetch (S6506: redirect safety)
- Removed -L (follow redirects) from curl since --proto =https handles the security concern

PR #920 was closed due to Quality Gate failure on these 2 security hotspots.
marcusquinn added a commit that referenced this pull request Feb 10, 2026
- Replace /dev/tcp with nc for SMTP connectivity testing (S5332: clear-text protocol)
- Enforce HTTPS-only with --proto =https on curl for MTA-STS policy fetch (S6506: redirect safety)
- Removed -L (follow redirects) from curl since --proto =https handles the security concern

PR #920 was closed due to Quality Gate failure on these 2 security hotspots.
marcusquinn added a commit that referenced this pull request Feb 10, 2026
…g + health check enhancements (t214)

* feat(email): add email testing suite with design rendering, delivery testing, and enhanced health checks (t214)

New email-test-suite-helper.sh provides:
- Design rendering validation (HTML structure, CSS compatibility, dark mode, responsive)
- Delivery testing (SMTP connectivity, header analysis, inbox placement scoring, TLS checks)
- Test email template generation for rendering verification

Enhanced email-health-check-helper.sh with:
- BIMI, MTA-STS, TLS-RPT, DANE, and reverse DNS checks
- Health scoring system (15-point scale with letter grades A-F)
- Score breakdown across all authentication and security checks

Decision: combined design rendering and delivery testing into single script
(matches existing pattern of comprehensive helper scripts like ses-helper.sh)

* fix(email): resolve SonarCloud security hotspots S5332 and S6506 (t214)

- Replace /dev/tcp with nc for SMTP connectivity testing (S5332: clear-text protocol)
- Enforce HTTPS-only with --proto =https on curl for MTA-STS policy fetch (S6506: redirect safety)
- Removed -L (follow redirects) from curl since --proto =https handles the security concern

PR #920 was closed due to Quality Gate failure on these 2 security hotspots.
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