1-8.1 Itemized Processing. Each piece of mail is individually listed by unique identification number, weight, and other pertinent information (see chapter 5). This option is not available for First-Class Mail presorted letter-size mailings and piece-rate Standard Mail® letter-size mailings.
1-8.2 Batch Processing. The mailing is divided into groups of mailpieces with consecutive identification numbers. Only the identification numbers of the first and last pieces of each group are listed, along with the piece count and the total postage charges for the entire batch. This method is limited to piece-rate letter-size and flat-size mailings (see chapter 6).
