Postal: Three Ways to Reduce Postal Costs and Increase Response

2. Use multiple ZIP + 4 ® engines. If your list services provider offers more than one process that appends ZIP + 4 codes to your housefile, Yapuncich notes that you’ll add 0.5 percent to 1 percent additional matches if your run your housefile to a second engine. This is important because without a ZIP + 4 code, you can’t get a match through most change of address files. The more ZIP + 4 codes you have, the more of your customers you’ll be able to track.