Publication 91 provides in-depth information concerning population of the electronic file. (See 2-1 for additional information about which types of bulk proof of delivery participation necessitate the use of an electronic file.) For participation in the bulk proof of delivery program, however, mailers must ensure that specific aspects of their electronic files conform not only to the rules outlined in Publication 91 but also to rules specific to this program. Note that a record in an electronic file might pass all error checks necessary for tracking, yet that record might not pass all edits necessary for bulk proof of delivery, therefore disqualifying that mailpiece from being part of a customer’s Signature Extract File or CD-ROM.
