A mailer requesting flexibility testing for letter-size mailpieces must submit at least five mailpieces and a written request to the local postmaster or business mail entry manager for submission to the Pricing and Classification Service Center (PCSC) at least 6 weeks before the mailing date. The request must describe mailpiece contents and construction, number of pieces being produced, and preparation level.
The PCSC evaluates the piece and, if warranted, instructs the mailer to submit samples to USPS Engineering for testing. The PCSC advises the mailer of its findings. If the Postal Service approves the mailpiece, the PCSC’s letter includes a unique number that identifies the piece and that serves as evidence that the piece meets the relevant standards. The mailer must include a copy of this letter with each postage statement that the mailer submits for mailings of the approved piece. If requested by the Postal Service, the mailer must show that pieces it presents for mailing are the same as those approved.
