A method, apparatus, and computer-readable medium are provided for merging data from multiple data sources for use in an electronic document. The method includes receiving field names and field data from an initial data source, mapping field names from a subsequently added data source to the initial data source, building a recipient list schema based on the field names from the initial data source and the mapped field names from the subsequently added data source, creating a recipient list according to the recipient list schema, and saving the recipient list to a file. The recipient list schema defines the relationships between the field names in the recipient list and the field names in the initial and subsequently added data sources.