A mailing system (1) includes a mailing machine (5) having a printing mechanism (11) for printing an indication of postage value on a mailpiece and structure for controlling relative movement between the printing mechanism and the mailpiece to ensure the mailpiece is properly positioned relative to the printing mechanism (11) during printing of the indication of postage value; a meter vault (3) having a securely sealed housing (12), and apparatus (51), within the securely sealed housing (12), for accounting for the printed indication of postage value, wherein the meter vault (3) is removably mounted in the mailing machine (5) for easy removal via a plug-in connector (21); and a printing mechanism control module (7) for securely controlling printing by the printing mechanism (11) based on data received from the meter vault (3), the printing mechanism control module (7) being removably mounted in the mailing machine (5) for easy removal via a quick disconnect connector (65); wherein the meter vault (3) and the printing mechanism control module (7) are in electrical communication via the mailing machine (5). The mailing system can also provide ciphered communications between the vault (3) and the printing mechanism (11).