Sharing some of the work done normally by the post office. In the early 1990s, the U.S. Postal Service initiated a ?worksharing? concept by introducing discounts for presorted and automated mail. The amount of the discount depends on the depth of the sort. The less work created for the post office, the greater the discount. Mail can be automated and bar-coded to three levels: the three-digit level; the five-digit level; and the carrier route level. The deeper the level, the more the mail moves downstream in the post office, and the greater the savings to you. There are many companies that provide mail presorting and automation services; they can be found on the National Association of Presort Mailers (NAPM) website: http://www.napmweb.org/.
Using a presort company can reduce your mailing costs by ten to twenty percent, depending on mail volumes.