A list of email addresses where some or all of the addresses were obtained using poor acquisition and opt-in practices and/or where some or all of the addresses have not been kept up-to-date over time. For instance, this might be the result of poor handling of hard bounces, poor handling of unsubscribe requests and/or not mailing to the addresses in a year or more.

A list of email addresses where some or all of the addresses were obtained using poor acquisition and opt-in practices and/or where some or all of the addresses have not been kept up-to-date over time. For instance, this might be the result of poor handling of hard bounces, poor handling of unsubscribe requests and/or not mailing to the addresses in a year or more.