The Z4CHANGE Option is a product provided by the USPS that can save you a considerable amount of processing time. The Z4CHANGE Option is extremely useful if you have large name-and-address files that you use frequently. The Z4CHANGE Option enables you to run that file through CODE-1 Plus and attempt to match:
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Only those records with ZIP + 4 Codes changed by the USPS since the file was last processed
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Records that were not successfully coded on previous CODE-1 Plus runs.
In other words, if you have a list that you already processed using CODE-1 Plus, you can run the list each month using the Z4CHANGE Option processing, and attempt to match those records with new ZIP + 4 Codes.
Note: Before you use the Z4CHANGE Option, you must run your entire file through CODE-1 Plus one time without using Z4CHANGE Option. Then, each time you want to mail records from your file, run the file again using Z4CHANGE Option processing. Your list stays current, but you do not expend processing time confirming records that were already correct.