Mailgun Inspect: Chrome extension for pre-send email QA
Mailgun Inspect, developed by Mailgun (Sinch), is a Chrome extension that brings pre-send email quality assurance into a browser-based workflow. The tool scans drafts for deliverability, visual rendering, accessibility, and asset integrity before messages are sent, and connects checks directly to developer and marketer processes. Key capabilities described by the developer include multi-client render previews, accessibility scans aligned to modern standards, spam-filter checks, and embed-friendly APIs. It targets developers, email marketers, and QA teams needing repeatable email testing within a Mailgun ecosystem.
Inspect succeeds a legacy testing platform and embeds QA where emails are authored
Inspect replaces the Email on Acid lineage and places testing into Chrome so teams can validate messages without switching tools. The extension is presented as a successor to the previous platform and integrates into developer workflows, which positions it for users who require preflight checks during email development and campaign staging rather than ad-hoc previews.
Render coverage spans many clients and includes dark-mode views
The suite produces visual renderings across a large matrix of clients and devices, including dark-mode optimizations that surface color and layout shifts. Visual testing covers mobile and desktop renderers, which helps surface client-specific layout breaks and styling regressions that otherwise appear only after send.
Designed for embedding and white-labeling inside developer pipelines
Mailgun built the product with an API-first approach and white-label capabilities, enabling platforms to integrate QA features into CI/CD flows or custom dashboards. That orientation makes the tool suitable for engineering-led teams and Martech vendors that need to present checks under their own brand.
Compliance and deliverability checks align with enterprise requirements
The testing suite includes automated accessibility scans aligned to current standards and pre-send checks against major spam filters, and it runs on Mailgun’s delivery infrastructure for scaled reliability. These elements aim to reduce compliance risk and provide preflight signals about inbox placement for transactional and campaign messages.
Mailgun Inspect is a practical choice for developer-led email teams
Inspect is a practical option for engineering and marketing teams already operating within Mailgun or enterprise email stacks who want repeatable preflight checks and integration into development pipelines. The trade-off is that its capabilities are aimed at scale and integration, making it less suited to occasional senders or simple, single-message previews. For teams with automated workflows, Inspect delivers a focused QA path that reduces late-stage delivery issues.
