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Email Quality Testing

Built-in email testing — no Litmus or Mailosaur needed.

17 automated checks that catch issues before you hit send. Subject line analysis, spam scoring, HTML validation, mobile optimization, accessibility, and more. Included free on all plans.

17 Quality Checks

Every email is analyzed across 17 dimensions before it leaves your account. Catch problems that hurt deliverability, rendering, and engagement — automatically, on every save.

  • Subject line length, emoji usage, and spam trigger words
  • Preview text optimization and Gmail clipping detection
  • HTML/CSS validation and inline CSS processing
  • Mobile optimization and responsive layout checks
  • Spam score analysis with per-rule breakdown
  • Link validation, image alt text, and dark mode compatibility
  • Personalization tag detection and spell check
  • Accessibility audit (contrast, heading hierarchy, link labels)
  • Authentication header checks (SPF/DKIM alignment)
  • Blacklist status check for your sending domain
  • Unsubscribe link detection and A/B subject suggestions
  • Optimal send time recommendations based on engagement data
A 92/100 Email Quality Score 17 checks completed 14 Pass 2 Warn 1 Info ✓ Subject Line 47 chars, optimal length Pass ✓ Spam Score Score: 1/10 - Clean Pass ! Mobile Optimization Font size 12px, min 14px Warn ✓ Unsubscribe Link Found, visible Pass ! Email Size 86KB, Gmail clips at 102KB Warn i Dark Mode No color-scheme meta Info

Test Mode & Inbox

Send test emails to a built-in test inbox and inspect every detail — rendered HTML, extracted links, merge tag resolution, and token substitution — before anything reaches real subscribers.

  • Capture test sends in an isolated test inbox
  • View fully rendered HTML with device previews
  • Extract and validate all links and tokens
  • Simulate bounce and complaint events for testing automation flows
Test Inbox Search Clear All All Campaigns Automations Transactional RECIPIENT SUBJECT QUALITY SOURCE TIME sarah@test.com Welcome to Acme! A Campaign 2m ago john@test.com Your order is confirmed B Transactional 5m ago lisa@test.com Day 3: Tips for success A Automation 12m ago mark@test.com Special offer inside! C Campaign 1h ago

Automation Dry Run

Test entire automation flows without sending a single real email. Step through every condition, delay, and action exactly as a real subscriber would experience it, with a full per-step results log.

  • Execute automation flows in a sandboxed dry-run mode
  • See step-by-step results with condition evaluation details
  • Catch broken branches and misconfigured triggers before going live
  • Compare dry-run results across multiple test subscriber profiles
Dry Run Results All steps passed 1 Trigger subscriber_added Pass 2 Send Email Welcome email captured Pass 3 Delay Would wait 2 days Skip 4 Condition Branch taken: yes Pass 5 Send Email Follow-up offer captured Pass

Real-Time in the Editor

The quality panel sits alongside your email editor and updates on every save. Fix issues as you write — no need to manually trigger a separate test run.

  • Live quality score that updates as you edit
  • Inline issue highlights mapped to specific content blocks
  • One-click suggestions for common fixes
  • Quality gate option to block sending below a minimum score
Email Editor Summer Sale is Here! Hero Image Shop Now Blocks Quality A 94/100 Subject Line Spam Score Unsubscribe Mobile Email Size HTML/CSS Links Dark Mode Accessibility Re-analyze

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Start using Email Quality Testing today — it's free

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