logo Straight to Inbox

Create & Send

Email Campaigns Email Editor AI Assistant Automations Transactional Email

Audience

Subscriber Management Segmentation Forms Builder Suppression Lists

Deliverability & Trust

Deliverability Inbox Deliverability Sender Protection Email Quality Testing Email Validation

Sending Infrastructure

Dedicated IPs IP Warm-Up Domain Warm-Up Bring Your Own Provider

Grow & Analyze

Analytics Dashboard API Access
E-commerce & Online Stores Course Creators SaaS Companies Marketing Agencies Newsletter Publishers Coaches & Consultants
Integrations Pricing Compare Blog
Log in Get Started

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.

Get Started Free

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

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.

Test Mode & Inbox
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

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.

Automation Dry Run
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

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.

Real-Time in the Editor
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

You might also like

Email Editor

Design stunning emails without writing a single line of code.

Learn more

Deliverability

Land in the inbox, not the spam folder.

Learn more

Automations

Put your email marketing on autopilot.

Learn more

Start using Email Quality Testing today — it's free

No credit card required. Get started in minutes.

Get Started Free Explore All Features