A postage metering system includes a computer, an authentication unit, a printer and a control system. The control system is in operative communication with the computer, the authentication unit and the printer. The authentication unit and the printer are both in operative communication with the computer. The printer includes an unsecure print head and a secure print head. The control system: (i) executes a transaction session between the computer and the authentication unit to generate postal data to be included in a postal indicium where the postal indicium includes non-authorization data; (ii) initiates a print request to print the postal indicium; and (iii) controls the unsecure print head to print the non-authorization data and the secure print head to print forensic evidence of the authenticity of the postal indicium.