Once an address has been matched against the address information files, the address list should be corrected accordingly. It is important to understand that failing to correct your address list with the matched data could result in lower match rates as the USPS address information files are updated. Lower match rates equal higher postage rates. A match implies that suffixes, directionals, spellings, and city names as found in the files are correct and necessary for efficient processing and delivery of mail. Other important elements are apartment or suite numbers, Post Office Box addresses, and a complete rural/highway contract route address (with route and box numbers). Addresses that have been standardized contain all the necessary address elements as matched against the ZIP+4 and City State files.