How to A/B Test Your Email Campaigns: Steps, Tips, & Tricks

Sarah is a Web Marketing Specialist at WebFX. Certified in Google Analytics and Google Ads, Sarah also specializes in content marketing, as well as marketing and advertising on ecommerce platforms like Amazon. In 2006, she was awarded Time Magazine’s “Person of the Year” award. When she isn’t polishing her award, she’s spending time with her flock of ducks. Follow her on Twitter @the_berry_bot.

“$44 for every $1 invested — yeah, right.” If that’s what you’re thinking every time you hear someone talk about email marketing’s impressive return on investment (ROI), you might want to think about introducing A/B testing to your email strategy.

Email A/B testing is a proven tactic for getting more value from email marketing.

That’s because A/B testing helps you understand your audience. You can learn what offers, phrases, or even emojis motivate them to open and act on your emails. Then, you can use that knowledge across email campaigns to drive leads, sales, and an impressive ROI.

Keep reading to get all the details on how to A/B test email campaigns, including:

If you’re looking to experiment with A/B testing for your email campaigns, try MyEmailFX for free!

What is A/B testing in email marketing?

Email A/B test example

In email marketing, A/B testing or split testing is the process of creating and sending two variations of an email campaign to two subscriber subsets and then determining which version performs best. Companies use split testing in email marketing to understand their subscribers better.

7 examples of what you can test with email A/B testing

You can test a range of elements with email A/B testing. A few examples include:

  1. Subject lines
  2. Personalization
  3. Images
  4. Length
  5. Layout
  6. Call to action (CTA)
  7. Offer

Limit your A/B tests to one element for the best results.

For example, experiment with two variations (A and B) of your subject line instead of testing two variations of your subject line and two variations of your CTA. When you limit yourself to testing one element, you make it easier to determine which changes influenced your results.

Why do email A/B testing?

Depending on what you test, like your email campaign’s design, email A/B testing can require a bit of time. It’s worth the investment, though, which is why more than 60% of businesses A/B test their emails.

A few reasons you should consider A/B testing your emails include:

Get immediate feedback from your target audience

Whenever you send an email, you get instant passive feedback from your target audience.

Based on whether they opened your email, interacted with it, or acted on your CTA, you can understand whether you hit or missed the mark. When you introduce A/B testing to your email strategy, you can get further feedback from your subscribers.

Do they like it more when you offer free shipping versus 10% off, for example? Or, are they more likely to see your email when you send it in the morning versus the afternoon? You can answer both questions with consistent A/B testing — and use that feedback to improve your entire email strategy.

Understand what CTAs, subject lines, and layouts work best

With continuous A/B testing, you can learn what works best for your audience.

One test may suggest subscribers love your free shipping offer. With consistent testing, you can confirm whether that offer is more persuasive than everything else you provide, like dollar or percentage discounts.

This benefit of email A/B testing allows you to incorporate data into your email marketing strategy. You stop guessing about whether subscribers will like an offer or respond to a specific CTA and instead gather data to prove (or disprove) your ideas.

Use A/B test takeaways on other channels

Once you discover which offers, phrases, or layouts work best, you can multiply that benefit by using them across email campaigns. In some cases, you may even extend those takeaways to other places, like your website or social media accounts.

For example, maybe the following CTA language works well: “Treat Yourself.”

In response, you open Google Optimize, which allows you to conduct A/B testing on your website for free, and start testing that language on your site. You discover that “Treat Yourself” also works well on your site pages, which helps you convert more website visitors into customers.

The above scenario is an excellent example of how you can multiply the benefits of email A/B testing.

How to A/B test your email campaigns

Are you ready to learn how to A/B test your email campaigns? Get started now:

1.      Pick what you’ll test

First, decide what you’ll test.

A few options include:

  • Subject line
  • Offer
  • CTA
  • Delivery time
  • ‘From’ name

If you use an email management software, like MyEmailFX or Mailchimp, it will make setting up your A/B test easy. With MyEmailFX, for instance, you can select whether you want to A/B test your subject line or email content.

Email A/B test options

When it comes to deciding what you’ll test, the following questions can help:

  • What is the goal of this email?
  • Who is our audience?
  • What action do we want subscribers to take?
  • What metric, like open rates, do we want to improve?

If you’re looking to drive orders as part of a limited-time promotion, for instance, you may choose to A/B test your subject line to encourage more opens or your CTA to motivate more subscribers to visit your website and place an order.

Once you decide which element you’ll test, you’ll want to create your A/B variations.

2.      Determine how you’ll measure your results — and success

Before launching your email A/B test, determine how you’ll measure your success.

Which metric will determine whether you classify version A as the winner or version B?

For example, if you’re A/B testing your subject line, you may use the open rate to determine the winner. In comparison, if you’re A/B testing your email’s CTA, you may reference the percentage of people that clicked on the CTA.

No matter how you approach this task, choose something measurable.

3.      Decide who you’ll test

Finally, decide who you’ll test.

Depending on your business, you may A/B test your entire list of email subscribers. Or, you may choose only to include a portion of your email subscribers in the A/B test. Your decision will likely depend on the size of your subscriber list, as you want to get statistically significant results from your A/B test.

Getting statistically significant results generally requires having at least 1000 subscribers in your test.

If you have less than 1000 subscribers, that doesn’t mean you shouldn’t A/B test. You can still A/B test and use your results to understand your audience better. As your list grows, though, you’ll likely see shifts in user behavior.

Again, if you use an email management software, it’ll make setting your test audience easy.

Email A/B test split example

In MyEmailFX, for example, you can set the percentage of subscribers that you want to A/B test.

If you’re managing your campaign without an email software, this step can become tedious. It’s time-consuming to separate subscribers into A and B groups. Plus, hand-picking subscribers make email A/B tests less objective, which can hurt test accuracy.

That’s why having an email management software is often a must for A/B testing emails.

5 email testing best practices to follow for your next A/B test

Now that you know how to A/B test email campaigns, set yourself up for success with these five email testing best practices:

1.      Test elements with the most impact first

Generally, you’ll want to test elements with the most impact.

Your subject line, for example, can have a massive influence on your email marketing performance. It determines whether people will open your email, which is essential. If someone doesn’t open your email, they can’t act on your CTA — or help you see which CTA performs better.

Work on the outside of your email first, like its subject line and sender name, and then move inside to your layout, content, CTAs, and other elements. This approach will help you improve metrics, like open rate, that serve as steppingstones to larger ones, like conversions.

2.      Ask “why” after every email A/B test

When it comes to A/B testing emails, it’s not enough to say, “A won, B lost.”

You need to ask why.

Why did version A win and version B lose?

Look at the differences between your two versions. Think about the impact those differences may have had on your audience. Did you offer a free shipping code in your subject line, for example, instead of a 10% off coupon?

This difference could suggest that your audience finds free shipping more persuasive than 10% off.

Asking “why?” helps you get the most value from A/B testing your email campaigns. You have takeaways that you can incorporate into future emails. Settle for A/B testing without the “why,” and you settle for a subpar email marketing strategy.

3.      Prioritize A/B tests with ICE

Whether you’re working alone or with a team, you probably have some initial A/B test ideas. From subject lines to button colors, you have plenty of options when it comes to experimenting with your emails.

Subscribers aren’t looking to get spammed with emails, though.

You’ll have to practice patience and test your emails over time, which means prioritizing all your test ideas. One acronym can help you organize and prioritize your email A/B tests: ICE, which stands for Impact, Confidence, and Ease.

ICE asks the following questions:

  • How much of an impact could this test have?
  • How confident are you that this test will have a positive impact?
  • How easy is it to implement this test?

You can incorporate ICE into your email marketing efforts with a simple Google Sheet.

Email A/B test sheet example

Just enter your ideas, and then a score for each ICE category. You could even color-code your scores, so it’s easy for everyone to understand whether a rating of three, for instance, means the test is harder or easier to implement.

This step may seem unnecessary, but prioritizing your tests will help you strategize your A/B tests.

4.      Use free email marketing tools

With some free email marketing tools, you can get even more value from your email A/B tests.

Headline Analyzer from CoSchedule, for example, is a handy tool for checking the quality of your subject lines. It’ll grade your subject line and provide feedback for how you can make it more persuasive and likely to draw attention.

Headline analyzer GIF

Sender Score is another valuable email marketing tool.

This free tool will check your sender reputation, which influences the deliverability of your emails. If you have a less-than-stellar reputation, that can affect how many people receive your emails, which can impact your email A/B testing efforts.

5.      Preview every A/B test before sending

People check and read emails on a range of devices, from their tablet to their desktop. They also use a variety of browsers and email clients, from Chrome to Microsoft Outlook. That’s why it’s vital to preview your email across these devices, browsers, and email clients before sending it to the masses.

Most email management applications, like MyEmailFX, will allow you to send test emails. This feature can make checking your A/B tests easy. Even if you aren’t A/B testing, it’s a best practice to double-check your emails for typos, missing links, and other errors.

Since you only get one chance to send your emails, it’s essential to test them beforehand.

Start your first email A/B test for free with MyEmailFX

Email A/B testing is a smart tactic to include in your email marketing strategy.

A/B testing your emails helps you learn more about your audience and incorporate those takeaways into future emails to generate not only more clicks and conversions but also create compelling email content.

If you’re ready to run your first email A/B test, you can get started for free with MyEmailFX!

For professional help with your email marketing strategy, as well as A/B testing, contact us online or call us at 888-601-5359 to learn how our email marketing services can make email a revenue-driving channel for your business!