The system and method of the present invention automatically provides dynamically generated completion information for facilitating user input of email addresses or contact information. This completion information is developed from a "data store" comprised of multiple data sources such as previously sent or received email, and other types of electronic files such as word processor or spreadsheet files. The present invention monitors and uses the information in the data store to automatically store, track, maintain, and organize data entries in a dynamic "resolution list". As a user begins to input an email address or contact, the present invention can either automatically complete the entry using a most probable result from the resolution list, or can display a list of likely matches from which the user may select the desired email address or contact.