You perform an A/B test for an email in HubSpot. You set the parameters so 25% receive version A, 25% receive version B, and 50% receive the winning version. You have 100 recipients in the send list. What happens?

HubSpot’s A/B test distribution requires a large enough recipient pool to split the audience and reserve a winning-version group. When the recipient count is too small, HubSpot does not run the configured split. Instead, the email defaults to version A for the full send. This prevents test results from being based on an audience size too limited to support the selected test structure.