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Activity must be in accordance with a written agreement between the shipper or the carrier of the letters and the Postal Service for payment of postage when postage is not affixed to the individual mailpieces. Such an agreement is prepared by Mailing Standards at Postal Service Headquarters, after the required postage amount is determined, a fixed payment schedule is determined, and time frames for periodic review are established. The agreement must be signed by the participating parties and approved by the manager of Mailing Standards.
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