Best Practices for A/B Testing in Email Marketing

Emily Collins09.15.2025

Share on:

Best Practices for A/B Testing in Email Marketing

Share on:

Frequently Asked Questions

Find answers to common questions about email verification.

What is A/B testing in email marketing?

A/B testing is the process of sending two variations of an email (subject line, design, or CTA) to a small portion of your audience to see which performs better before sending the winning version to the rest of your list.

What should I test in my email campaigns?

You can test subject lines, email copy, call-to-action buttons, images, design layouts, and even send times. Start with one element at a time to get clear results.

How big should my audience sample be for A/B testing?

A good rule of thumb is to test with at least 10–20% of your total list. This provides enough data for accurate results without risking the entire campaign on an unproven version.

How do I know if my A/B test results are valid?

Look at key metrics like open rates (for subject line tests) and click-through rates (for CTA or design tests). Use statistical significance tools to confirm the winning version is truly better, not just a random spike.

More blogs like this:

Spam Trap Checker | Email Validation & Protection

Discover how VitaMail’s spam trap checker protects your email campaigns. Detect spam traps in real time, clean your lists, and improve deliverability with advanced validation tools.

Tuesday, September 9, 2025