MailSlurp logo

Email compatibility tester for rendering, links, and pre-send QA

MailSlurp catches rendering defects, broken links, missing images, and client support issues before campaigns and transactional templates go live.

Email compatibility testing across devices

Trusted by top companies worldwide

  • Broadcom
  • Scraper
  • Trivago
  • Avast
  • Wolt
  • Panasonic

Product features

What teams need from email QA

Use the MailSlurp features that make the workflow work reliably in production, not just in a quick demo.

Preview runs across mailbox clients and devices

Render the delivered message across the mailbox clients and device classes that matter before sign-off depends on one local preview.

  • -Provider-targeted preview runs for launch-critical templates
  • -Screenshot artifacts for each preview target
  • -One primary preview for launch review
Explore

HTML and CSS support matrix by client and OS

Detect the HTML and CSS features inside the message and flag where support is weak across clients and operating systems.

  • -Feature-level compatibility warnings
  • -Support snapshots by client family
  • -Clear markup risks before send
Explore

Broken-link, image, and HTML validators

Check broken CTA destinations, missing assets, and malformed HTML in the same review pass instead of stitching together separate tools.

  • -Broken-link and redirect detection
  • -Missing-image and asset health checks
  • -HTML validation messages in one report
Explore

Spelling, readability, and scored audit output

Store scores and issue counts so teams can review, block, or rerun a template check with confidence.

  • -Spelling and content-quality findings
  • -Health score with pass and fail counts
  • -Review artifacts for repeat launches
Explore

High-value workflows for campaign and template QA

Start with the workflow you need most, then expand the same MailSlurp setup into adjacent use cases once the first route is working.

Run rendering checks before launch approval

Review how your template behaves across email clients and screen types before a high-stakes send.

MailSlurp product screenshot

Catch broken links and missing assets before send

Scan templates for dead links, invalid images, and malformed content that would otherwise surface after launch.

MailSlurp product screenshot

Use the same QA discipline for product email

Apply release-grade rendering and content checks to signup, reset, onboarding, and operational templates.

MailSlurp product workspace showing email, phone, dashboard activity, and developer automation

Developer integration

Capture the delivered message before preview and QA checks

Wait for the real message to arrive, render screenshots from the stored email, and keep preview and audit checks tied to the exact artifact customers receive.

  • Capture the delivered email before running previews and validators
  • Render screenshot artifacts from the stored message instead of a copied template fragment
  • Keep review anchored to one inbox-backed record

Catch bad sends early

Put campaign and template QA on the same footing as application QA

Make high-impact email quality issues visible before launch and give every team the same results for approval and rollback decisions.