DataQualityApps.com provides software for error-tolerant matching and removal of duplicate records containing contact information of advertising recipients. Sophisticated address matching algorithms use fuzzy logic and allow for the highest quality matching of postal addresses entered in various formats, including variations such as street designations, abbreviations, and the use of unit/apartment numbers before or after street numbers. The address matching algorithms take into consideration common typos, inverted words, and various additions such as prefixes and suffixes. Along with mailing addresses, this software takes care of duplicate email addresses and phone numbers. Using the software at DataQualityApps.com helps direct marketers do a better job complying with recipients’ opt-out requests, reduces acquisition and management costs of direct marketing contact lists, and ensures that no single recipient is ever contacted more than once within a single marketing campaign. This software makes it easy to create and maintain ‘black lists’ of opted-out recipients by checking each subsequently acquired contact against the list. The software at DataQualityApps.com saves advertisement costs, improves customer relations, and makes it easier to direct marketers to comply with local regulations regarding the handling of opted-out recipients. The tool helps reduce costs for the redundant maintenance of customer contact records, and effectively eliminates double solicitations.