A method and apparatus for printing an information-based indicia program (IBIP) postage in a computer printing subsystem is disclosed wherein a third-party word processing software with mail merge capabilities generates text and a matching address as the input for a client application in high-volume document processing and mail systems without programmatically altering the word processing program to accommodate the printing subsystem. Addresses are validated and corrected in the printing subsystems prior to creation of the indicia image and address image to be printed on the mailpiece.