Overview
Use the Split Sendout settings to configure and control an A/B test for email campaigns. In this view, you define which recipients participate in the test, how message variants are distributed, when the split sendout starts, and how the winning variant is sent to the remaining recipients.
The settings described on this page apply to email split sendouts and are used before any messages are sent.
Navigation Path
Messages > Draft Messages > Email
Select two or more email drafts, then click Split Sendout.
For a conceptual overview of email message types and the overall email creation workflow, see the Email Channel Basics.
Basic Configuration
Use these settings to define the core behavior of a split sendout. These settings are required to run an A/B test.
Group
Defines the recipient group used for the split sendout.
All split variants are sent to members of this group.
If a main sendout is started, the remaining recipients in the same group receive the winning variant.
Channel
Displays the Email channel. The channel is fixed and cannot be changed for a split sendout.
Split Distribution
Defines how recipients are distributed across the split variants.
You can define the distribution in one of the following ways:
Percentage of members: Specifies the percentage of the group that receives each variant. The total percentage for all split variants must be less than 100%.
Number of members: Specifies the exact number of recipients that receive each variant. The total number must be lower than the total group size.
Each recipient receives only one variant.
Time Zone
Defines the time zone used for the split sendout and the main sendout.
The selected time zone can differ from the time zone of the user who creates the sendout.
All scheduled times are evaluated based on this time zone.
Split Sendout
Defines when the split variants are sent.
Immediately: The split sendout starts as soon as you send the message.
Later: The split sendout starts at a specific date and time.
Main Sendout Starts
Defines how and when the winning variant is sent to the remaining recipients in the group.
You can choose between the following options:
Manually
The system does not start a main sendout automatically.
All message variants remain available after the split sendout.
You review the results and manually select which variant is sent as the main sendout.
Automatically
The system automatically selects and sends the best-performing variant.
When this option is enabled, the following settings are available:
Recipients for Main Sendout: Displays the number or percentage of recipients who will receive the main sendout. This value is calculated automatically.
Main Sendout: Defines the date and time when the winning variant is sent.
Criteria: Defines how message performance is evaluated. The variant with the best performance based on the selected criterion is used for the main sendout.
Available evaluation criteria include:
Highest opening rate
Highest click rate
Highest number of conversions (requires conversion tracking)
Lowest unsubscribe rate
If no clear winning variant can be identified, the system uses the first message selected for the split sendout.
Timing Behavior for Main Sendouts
If the split sendout has not finished when the scheduled main sendout time is reached, the system delays the main sendout.
The main sendout is delayed in 10-minute intervals.
Delays can continue for up to 24 hours.
If the split sendout is still not completed after 24 hours, the main sendout is canceled.
Advanced Options
Use these settings to refine or optimize the split sendout. These options are not required and are typically collapsed by default in the user interface.
Segment
Limits the split sendout to a subset of the selected segment.
If a segment is used, the split distribution must be defined as a percentage.
If the split distribution is defined as a number, the system automatically converts it to a percentage.
The same segment is applied to the main sendout.
Best Sendout Time
Optimizes the sendout time based on previous recipient behavior. See Best Sendout Time
Inbox Monitoring Tests
Allows you to include inbox monitoring for split or main sendouts. See Inbox Monitoring
Canceling a Split Sendout
To cancel a split sendout, open the Outbox.
A split sendout can be canceled:
Before any split messages are sent, or
After split messages are sent but before the main sendout starts.
When a split sendout is canceled:
No further messages are sent.
Existing statistics for sent split messages remain available.
The split sendout cannot be resumed or restarted.
Deleting a Split Sendout
You can delete a split sendout only from the Outbox. Deletion permanently removes the split sendout and its statistics.
A split sendout can be deleted:
Before any split messages are sent, or
After split messages are sent but before the main sendout starts.
When a split sendout is deleted:
All statistics for sent split messages are permanently removed.
The main sendout is canceled and cannot be rescheduled.
Draft messages used in the split sendout remain available and can be reused.
This action cannot be undone.