Posted in Web 235 Mail Preparation | Postal Explorer – USPS November 19, 2019 235 Mail Preparation. Overview. 1.0 General Definition of Terms. 2.0 Bundles. 3.0 Letter Trays. 4.0 Tray Labels. 5.0 Preparing Nonautomation Letters. 6.0 Preparing … https://pe.usps.com/text/dmm300/235.htm