The database list should be in the exact form necessary for the print application. The list includes the name, address, and personalized information for each entry. Addresses can be checked for validity with CASS (Coding Accuracy Support System) certified software, which provides verified addresses and enhanced geographic data to add accuracy and value to corporate databases. Organizations that use CASS-certified software may be eligible to receive discounts in bulk mailing rates. PostNet barcodes can be added to each entry in the database with the use of software that can produce the numeric PostNet code from the address data and then insert it into the database.

Databases should be revised and edited for the following:

• Duplicate files must be removed.
  
  
• Old or invalid data should be deleted.
  
  
• Spelling must be checked. Potential customers will not appreciate having their name misspelled and may take their business to a competitor.
  
  
• All image files should be in the proper formats.

Maintaining a database can be overwhelming, especially for people who are not experts in the field. If your organization does not have someone with database experience, it may be beneficial to seek the help of a service bureau that specializes in database development and maintenance.