A computer implemented method for a mail tracking service provider to manage mail tracking identification codes for customers. A master list is maintained of identification codes that have been provided to customers. A customer sends a request for a block of identification codes to use with their mailing. The service generates a block of identification codes, referring to the master list to determine identification codes that are not already being used. The generated block is sent to the customer. The service updates the master list to identify the customer and the block sent. The mailer sends mailing job data back to the tracking service. The job data identifies which codes from the block have been placed on mail to be delivered. The service gathers data about the delivery of the mail from the carrier service, and the tracking data is consolidated and provided in a report to the customer.