The mailer is responsible for proper postage payment. Subject to the corresponding standards, postage and fees for Bound Printed Matter must be paid by permit imprint, as defined in 604.5.0. Mailings may contain nonidentical-weight pieces only when authorized by Business Mailer Support unless mailed under 2.2. Identical-weight pieces must be separated at acceptance into groups that contain pieces all subject to the same zone and same combination of prices (e.g., all are zone 4), unless mailed under 705.2.0 through 705.4.0 in Advanced Preparation and Special Postage Payment Systems.
Nonpresorted, nonidentical-weight pieces may be separated by weight, reported on separate postage statements and documented under 2.2 or must be documented or authorized as follows:
a. A maximum of 299 nonpresorted, nonidentical-weight pieces may be individually numbered and listed by the mailer on PS Form 8042, Bound Printed Matter Documentation, and submitted with a properly completed postage statement.
b. Mailings of 300 or more nonpresorted, nonidentical-weight pieces must be authorized by Business Mailer Support and mailed under 705.2.0 through 705.4.0.