MAILING SERVICES — GIVING POSTAGE ITS DUE

The USPS publishes a list of vendors offering presorting software that is “certified”—chiefly for CASS and PAVE presorting. These and other acronyms related to mailing solutions are explained in the sidebar to the right.

The definitive reference for all things postal—within the United States—is the “Domestic Mail Manual” (DMM). Contained within its more than 1,700 pages are official rates and standards for all domestic mail services. Updates are published monthly in a separate “Summary of Changes.”