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Effective November 14, 2013, the Postal Service™ will only accept non-adhesive letter and flat-tray labels for First-Class Mail®, Periodicals, and Standard Mail® that meet the criteria listed in the Mailing Standards of the United States, Domestic Mail Manual (DMM®) section 235.4.0. This standard is being enforced as adhesive labels take longer to remove from trays and frequently damage label holders. The Postal Service is working with the Mailing Industry to evaluate the technological and operational feasibility of alternatives to current labeling methods.
— Product Classification,
Pricing, 11-14-13
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