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Email template testing with Litmus and Email on Acid
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litmusemail on acidemail testingemail clientscross-client testingdark mode email
Problem
Developers send emails without testing across clients, then receive complaints from users using Outlook, Samsung Mail, or dark mode. Manually testing across 90+ email client/device combinations is impossible without tooling.
Solution
Integrate Litmus or Email on Acid into your email development workflow. Both services render screenshots of your email template across all major email clients. Use them before every major template change or campaign send. Litmus also offers automation via API.
Why
Email client rendering is non-deterministic without testing. Litmus and Email on Acid maintain real devices and email client installations and programmatically send your HTML through each to capture screenshots, dramatically reducing cross-client bugs.
Gotchas
- Screenshots do not capture dynamic content or interactive elements — test live links manually
- Dark mode rendering varies significantly across clients — always test dark mode variants
- Litmus API allows automated pre-send checks in CI pipelines
- Testing tools show layout but not deliverability — use a separate inbox placement tool (GlockApps, Mail-Tester) for spam score testing
Context
Email template development and pre-send QA for marketing or transactional emails
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