What is A/B testing in email campaigns, and what should you test?

• A. A/B testing involves sending the same version to all recipients.
• B. A/B testing is only for subject lines.
• C. A/B testing only tests color of buttons.
• D. A/B testing means sending two variants to a sample to compare performance; test subject lines, send times, CTAs, images, and content.

Answer: (D)

A/B testing in email campaigns is about comparing two variants to see which performs better on a chosen metric. The idea is to send two versions to a subset of your audience, measure how they respond, and then send the winner to the rest, so decisions are based on data rather than guesswork. You test elements that influence recipient behavior, such as subject lines (which impact open rates), send times (which affect when people see and engage), calls to action (which drive clicks), images and layout (which influence attention and readability), and the overall content (which affects relevance and engagement). To get meaningful results, test one variable at a time when possible, use a sufficiently large sample to reach statistical significance, and track clear metrics like open rate, click-through rate, conversions, and revenue. In short, you compare two variants to determine which performs better, and you test the elements that most strongly shape engagement.