Email on Acid — independent third-party profile of a public API surface, by API Evangelist. Email on Acid (now branded as Mailgun Inspect) is an email testing and pre-deployment quality assurance platform with a REST API for rendering email previews across 100+ email clients and devices, checking accessibility compliance (WCAG 2.2), validating HTML
accessibility html-validation email-testing apis-json email-clients spam-testing email-previews email-quality-assurance pre-deployment-testing
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Updated
Oct 4, 2026