Email A/B Testing That Picks the Winner Automatically
Test subject lines, send times, content, and CTAs. Mailsend runs the experiment with a sample group, identifies the winner by your chosen metric, and sends the winning version to the rest of your list - automatically.
What You Can Test
Subject Lines
The single highest-impact A/B test. A better subject line can lift open rates by 30-50%. Test length, tone, personalization, and curiosity.
Send Time
Find when your audience is most likely to open. Test morning vs. evening, weekday vs. weekend - let data decide.
Email Content
Test different value propositions, CTA placement, image vs. text-heavy layouts, and offer framing.
CTA Buttons
Button text, color, size, and placement all affect click rates. Test systematically and let performance guide design decisions.
From Name / Sender
Test whether 'Sarah from Mailsend' outperforms 'Mailsend Team' for your audience. Sender identity matters more than you think.
Automation Steps
A/B test individual emails within automation flows. Find the messaging that moves subscribers to the next stage of the funnel.
How Mailsend A/B Testing Works
Create Variant A and Variant B
Write two versions of your email - different subject lines, content, or sender names. You can test multiple variants simultaneously.
Set Your Test Conditions
Choose the sample size (e.g., 20% of your list), the winner metric (open rate, click rate, or conversions), and the wait time before declaring a winner.
Mailsend Runs the Test
Both variants are sent to your sample groups at the same time. Mailsend monitors performance in real-time.
Winner Is Picked & Sent Automatically
After your wait period, Mailsend identifies the winning variant and automatically sends it to the remaining 80% of your list. Zero manual work.
Stop guessing. Start testing.
A/B testing is included on all Mailsend plans. Run your first test today - no setup fees.