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 .