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Introducing Mailgun Inspect: Smarter Email Testing for Better Delivery
Product Release: Introducing Mailgun Inspect
Inbox placement is too important to leave to chance. That’s why we built Mailgun Inspect—a suite of email testing tools designed to catch costly mistakes that hurt your deliverability before your emails ever leave the dock.
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Introducing Sinch Mailgun Inspect: The email testing suite for flawless delivery
Email testing has long been a critical but time-consuming part of campaign production. From previewing how your email renders on mobile to making sure they’re accessible to every subscriber, teams juggle multiple tools, tabs, and steps—all before hitting send.
We thought it was time to simplify things. That’s why we’re proud to introduce Mailgun Inspect, with tools that streamline testing, improve accessibility, and optimize your inbox placement.
Table of contents
Accessibility checker
Email testing tools
Email previews
API-first flexibility
04
Why now?
Why we built Mailgun Inspect
Inboxes have evolved and so have sending practices. The cost of a broken or inaccessible emails are higher than ever. According to our 2025 State of Email Deliverability Report, nearly 48% of senders cite avoiding the spam folder as their top challenge, and almost 40% rarely or never conduct email list hygiene. Meanwhile, Gmail and Yahoo’s latest sender requirements have made things like spam complaint thresholds non-negotiables.
Mailgun Inspect is here to help you stay ahead of these changes—so you don’t just reach the inbox but make the best impression once you’re there.
What’s inside Mailgun Inspect?
Accessibility checker
ADA and EAA compliance isn’t just good practice—it’s should be a requirement with 1 in 6 people benefiting from email accessibility. Mailgun Inspect’s accessibility tools ensure your emails meet current and evolving standards, with automated scans for contrast, screen reader support, and more.
Make content more inclusive with semantic HTML checks.
Flag missing alt text, poor contrast, or structural issues.
Reach every subscriber, regardless of ability or device.
Email testing tools
Spot issues before they impact performance. Test for broken links, slow-loading images, inaccessible design, or spammy language that might get flagged. Inspect lets you simulate inbox delivery to identify and fix common pitfalls—early.
Analyze subject lines and headers to improve open rates.
Optimize image rendering across clients and devices.
Validate every CTA, button, and tag with pre-send tests.
Email previews
Your email may look great in one client and fail miserably in another. With Mailgun Inspect, you can preview your email across 100+ devices and clients, including dark mode. Because what your subscribers see should be what you intended—no surprises.
See side-by-side previews of major devices and browsers.
Test sender name, subject line, and preheader in the inbox view.
Perfect your design for every device your subscribers use.
API-first flexibility
Whether you're a lean startup or enterprise platform, Inspect scales with you. Plug our tools directly into your platform with RESTful APIs and white-label capabilities, or access everything from our intuitive UI.
Who is it for?
Mailgun Inspect is for teams who won’t compromise on email performance. If you’re stuck testing in a limited set of clients and devices, Inspect expands your coverage to 100+ environments so nothing slips through the cracks.
For businesses navigating accessibility and compliance standards, Inspect flags issues before they become risks. And with unlimited user access, you’re free from per-seat pricing models that charge more for less. Whether you're building, testing, or scaling—Inspect keeps every email sharp, secure, and ready to deliver.
Why now?
We’re living in the era of tighter rules and smarter inboxes. Bulk senders face higher scrutiny, and inbox algorithms are more sensitive than ever. Mailgun Inspect gives you the tools to test early, fix fast, and stay ahead.
