The A/B Test functionality in Adobe Campaign allows you to define two to three email variants. Each variant is sent to population samples in order to determine which has the best result. Once determined, the winning variant is then sent to the remaining population. You can choose to vary the email’s content, subject, or sender.
Learn how to configure and send an A/B test to test the subject line of an email.
See the product documentation for more details on how to test the content or the sender.