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Testing, QA & Optimization of Content

You must test before you send. This section covers the "pre-flight checklist" of rendering tests—using tools (like Litmus or Email on Acid) to see how your email will actually look in 100+ different clients (Outlook, Gmail, iPhone, etc.).

11 questions in this topic

What is pre-send testing? What is rendering testing and which tools do it? How to check dark-mode and mobile previews? How to validate links and images before sending? What’s the role of spam-testing tools (Mail-Tester, SpamAssassin)? How to test plain-text fallback? What’s A/B vs multivariate testing? How to interpret statistical significance in email tests? How often should templates be audited? What’s a “code debt” in email templates? How to set up template version control?