Pieces are eligible if not required to be mailed at First-Class rates or not eligible for Periodicals rates. Rates limited to 5-digit ZIP Codes identified in the City State File. Carrier route information updated using CASS-certified process within 90 days before mailing date. For additional marking standards for carrier route pieces, see M014 . See below for tray label Line 2 information.
Additional standards apply to mailings of nonidentical-weight pieces.
Use an optional endorsement line or carrier route information line. Postcard-size pieces must be banded. For Line 1, use city, state, and 5-digit ZIP Code on mail. 5-digit trays are required if there is enough mail for a full tray, optional otherwise, but preparation of content must be as described. For Line 1, use city, state, and 5-digit ZIP Code on mail.