1.0 Basic Standards for Postage Payment
[1-17-16] Retail Priority Mail Express postage may be paid with adhesive stamps (see 604.1.0), with meter stamps (see 604.4.0) affixed to each piece, or with USPS Click-N-Ship. The mailer is responsible for proper payment of postage.
Meter stamps may be used to prepay reply postage on any Priority Mail Express shipment under 604.4.5.2.
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