Each email address we provide was recently used to sign in to one of our publishing partner sites from same device that is now visiting your site. Our proprietary technology determines identities at the device level, which allows for far greater accuracy than IP-based or any other probabilistic methods.
Of course, household members sometimes share a device, and the average person has multiple email addresses—we aim to give you the best address for retargeting.
To ensure that you see bounce rates well under 1%, we perform multi-step delivery validation on every email address.