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Create A/B testing campaign

Last update: November 5, 2026

You can easily create and send an A/B testing email campaign in MailBluster by following a few simple steps. First, go to your Brand > Campaigns and the click on Create new.

Select Campaign and click on create new

Now select A/B testing campaign.

Select A/B testing campaign

A new A/B testing campaign window will appear. Enter the Campaign name and select the appropriate Audience. You can send the campaign to All subscribers or Subscribers of a segment.

Select the audience of campaign

Next, configure the Test Settings. Use the Split rule to select the percentage of recipients who will receive Variant A, Variant B, and the winning version.

Then choose how the winning version will be determined:

  • Highest open rate
  • Highest click rate
  • Choose manually

You can also choose to send the winning version Automatically or Manually and set the Test duration.

Set up the test settings

In the Info section, enter the details for Variant A and Variant B, such as the variant name, subject, preheader text, sender name, sender email address, and reply-to email address.

If you want to use the same information as Variant A for any field in Variant B, enable Same as Variant A

Give info of the campaign

Next, select the Delivery option for both variants. You can choose Send now or Schedule and select the appropriate timezone.

Choose the MailBluster branding option according to your plan. You can also click Send test email to check your email before sending.

Once everything is ready, click Continue. Review the campaign details and send or schedule your A/B testing campaign.

After the test duration ends, MailBluster determines the winning version based on the option you selected. If Automatically is selected, the winning version is sent to the remaining recipients automatically.