How to Use A/B Testing to Optimize Your Email Marketing Performance in HubSpot

[GianVilla]

As a Customer Success Manager here at HubSpot, I see firsthand how a few small experiments can unlock big wins in your marketing. One of my favorite strategies to help customers get better results, no matter their industry or list size, is A/B testing for emails. It’s simple, it’s powerful, and best of all, HubSpot makes it approachable for everyone.

Why A/B Test Your Marketing Emails?

Every audience is different, and what works for one list may fall flat for another. A/B testing is your key to understanding your own audience’s preferences. Whether you want to boost open rates by finding the perfect subject line, or increase clicks with a more compelling call-to-action (CTA), testing allows you to make data-informed decisions, no guesswork required.

Benefits you’ll see with A/B testing in HubSpot:

• Better Open Rates: Find out which subject lines resonate.
• Higher Click-Throughs: Identify the email copy, images, or buttons that spark action.
• Continuous Improvement: Each test gets you one step closer to your best-performing campaigns yet.

How to Set Up an A/B Test in HubSpot

Setting up your first test is easy:

1. Go to Marketing > Email in your HubSpot portal.
2. Create a new regular email (A/B testing is available for regular, not automated emails in Marketing Hub Professional and Enterprise tiers).
3. Click “Create A/B test” at the top of the edit screen. This lets you build two versions, A and B.
4. Decide what to test: Focus on one variable at a time, like the subject line, a different CTA button, or a new image.
5. Set your distribution: Choose what percentage of your recipients will see each version. You can let HubSpot send the winning version automatically after a sample or evenly split your entire list.
6. Review and send! HubSpot tracks opens, clicks, and results for you in real time.

For a full walkthrough: How to Test Marketing Emails with A/B Testing (Knowledge Base).

What Should You Test? (And Where to Start)

If you’re just getting started, your best bets are usually:

• Subject Lines: Try different wording, lengths, personalization, or emojis.
• Preview Text: See what entices recipients before they even open.
• Email Content: Test headlines, body copy, images, or offers.
• CTA Buttons: Experiment with button color, text (“Get Started” vs “Learn More”), or placement.

Pro Tip: Only test one thing at a time. That way, you’ll know what actually drove better results.

Analyzing Results and Next Steps

Once your email has been sent, it’s time to let the data guide your next move. HubSpot’s email dashboard will show you:

• Open Rates: Great for subject line tests.
• Click Rates: Perfect for content and CTA experiments.
• Engagement Metrics: Like time spent reading or replies.

Focus your analysis on your test objective: If you tested a subject line, look at open rates. If you swapped a CTA, look at clicks.

Here’s a useful guide on reading your results: Analyze Marketing Email Performance (Knowledge Base).

And for strategy: Email Marketing Certification Course(HubSpot Academy).

Final Tips:

• Record Your Learnings: Keep a simple spreadsheet of what you tested and what worked. Future-you will thank you!
• Stay Consistent: Make testing a habit, not a one-and-done. Your audience’s preferences can shift over time.
• Ask for Feedback: Sometimes, the best insights come from just asking your subscribers directly what they want to see.

If you’re new to A/B testing, don’t stress about achieving perfection. The value comes from consistently learning, adapting, and celebrating even the small wins with your team!