Create A/B Split Segments in All Contacts

A/B Split Segments let you divide a group of contacts into randomized subgroups. This is useful for testing subject lines, comparing offers, or staggering sends to avoid email server overload.

Open the Segment You Want to Split

1. Go to Audience Center > All Contacts.
2. Find the segment you want to split (e.g. Engaged Web Leads).
3. Click ⋯ More and select Generate A/B Split.

Configure Your Split

Choose how many groups you want and how contacts should be divided.

• Split Name: This label will be added to each new subsegment (e.g. “Split A,” “Split B”).
• Number of Splits: You can create 2–30 groups.
• Split Type: Choose % for even distribution or # for fixed counts.
• Custom Adjustments: Edit individual group sizes if needed. Locked values won’t change when you edit others.

Suppress Undeliverable Contacts

You can remove contacts who can't receive emails - useful for clean testing and accurate results.

• Select Suppress all non-deliverable contacts to exclude opt-outs, hard bounces, spam complaints, and missing emails.
• Optionally, suppress specific segments (e.g. Internal Test Contacts).

Regenerate Later (Optional)

Enable the Allow this split to be regenerated option if your parent segment will change and you want updated splits later.

• Click ⋯ More on the parent segment
• Select Regenerate A/B Split
• Choose the same split name or make changes

Save and Use Your Splits

Click Submit to create the splits. Each group appears as a subsegment under the parent. These are:

• Direct Select segments – they won’t auto-update like query segments
• Fully editable – you can rename, reorder, or delete individual splits
• Available for use in emails, Automated Programs, reports, and more

Next Steps

• Find and Understand Segments
• Organize your segments in folders
• Delete or regenerate old A/B splits