The U.S. Postal Service recently announced an aggressive approach to reducing undeliverable-as-addressed mail by limiting postal automation discounts to only those mail pieces that have a confirmed primary address. This supports Postmaster General John Potter's challenge to reduce UAA mail 50 percent by 2010. The changes are part of CASS cycle L, which takes effect Aug. 1, 2007. Like many changes in this industry, the details of how this affects mailers are not always readily visible.