A system and method for postage payment utilizes passive RFID tags as postage “stamps”, with the amount of the postage automatically billed to a previously-established customer account. The tags are stored in a separate stamp database and are “enabled” by linking the individual tag to a customer account. The use of the RFID stamps eliminates the need for the customer to know the proper postage beforehand. The existence of a customer account with a proper return address reduces the likelihood of a dead letter. Also, a special category of stamps may be used for automatic reply mail. By virtue of using an RFID tag, the mailed item's progress through the postal delivery system may be tracked from dispatch to delivery.