In A/B testing, besides subject lines, what elements should you test?

• A. Only the subject line.
• B. Send times, CTAs, images, and content.
• C. The sender's name.
• D. The unsubscribe process.

Answer: (B)

The main idea is that something beyond the subject line usually drives how people engage with an email. In A/B testing, you optimize multiple touchpoints that influence open, read, and act rates. Testing when you send the email helps you find the times your audience is most likely to check their inbox. Trying different CTAs shows which button text, placement, and design lead to more clicks. Varying images can boost visual appeal, load performance, and perceived value. And testing content itself—length, structure, topics, personalization—lets you see what resonates with readers. Together, these elements create a broader optimization surface than the subject line alone and often move open and especially click-through and conversion rates more than subject-line tweaks.

As you run tests, compare each change against a clear control and track metrics like open rate, click-through rate, and conversions to understand what truly drives improvement.