Not every element repays a test, so prioritize the ones personalization directly touches. Five categories earn priority: subject lines (the highest-leverage target, since they decide whether the email is opened at all), dynamic content blocks (AI recommendations vs. manual curation, filtering approaches, number of slots), tone and language (formal vs. conversational, technical vs. benefit-focused, short vs. long copy), calls to action (generic vs. personalized wording, single vs. multiple, placement), and visual elements (generic vs. dynamic images, personalized vs. standardized banners). Isolate one variable per test and match the metric to the hypothesis, acting only on results that clear statistical significance.
Full guide → A/B Testing and Optimizing Personalization
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