US Patent 7984297 System and method of spam proof e-mail bounce tracking

A system may account for the number of bounced e-mails by adding a number of records over the desired quantity to ensure that a minimum number of e-mails are not returned. To calculate an accurate number of extra records to identify, a system may need to track the percentage of messages returned and add a number of records equal to that percentage over the minimum number required by the particular campaign. However, unless the system accurately identifies a bounced e-mail as one originating from the system, spam or other unsolicited e-mail sent to the system may result in inaccuracies.