Pieces mailed at card rates and pieces mailed at letter rates must meet separate 500-piece minimums. A certified process must be used at least once a year to ensure accuracy of 5-digit ZIP Codes. See below for tray label Line 2 information.
Additional standards apply to mailings of nonidentical-weight pieces.
See Quick Service Guide 900 . Packaging not required if sufficient quantity to fill a 5-digit tray. For Line 1, use city, state, and 5-digit ZIP Code on mail. For Line 1, use L004 for destination facility. Any remaining pieces must be packaged in mixed ADC packages.